Excessive loss of bloodproduces sleep. We can very readily understand why this should be so if we adopt the theory which has been supported in the foregoing pages. It would be exceedingly difficult to explain the fact upon any other hypothesis. I have seen many instances of somnolency due to this cause. It acts not only by directly lessening the quantity of blood in the brain, but also by so enfeebling the heart’s action as to prevent a due supply of blood being sent to the cerebral vessels.
Debilityis almost always accompanied by a disposition to inordinate sleep. The brain is one of the first organs to feel the effects of a diminished amount of blood or a depraved quality of this fluid being supplied, and hence, in old age, or under the influence of a deficient quantity of food, or through the action of some exhausting disease, there is generally more sleep than when the physical health is not deteriorated.
The action of certain medicines, and of other measures capable of causing sleep, not coming within the range of ordinary application, will be more appropriately considered hereafter.
THE PHYSICAL PHENOMENA OF SLEEP.
The approach of sleep is characterized by a languor which is agreeable when it can be yielded to, but which, when circumstances prevent this, is far from being pleasant. Many persons are rendered irritable as soon as they become sleepy, and children are especially liable to manifest ill temper under the uncomfortable feelings they experience when unable to indulge the inclination to sleep. It is somewhat difficult to analyze the various phenomena which go to make up the condition called sleepiness. The most prominent feelings are an impression of weight in the upper eyelids, and of a general relaxation of the muscles of the body, but there is besides an internal sensation of supineness, enervation, and torpor, to describe which is by no means easy. This sluggishness is closely allied in character if not altogether identical with that experienced before an attack of fainting, and is doubtless due to a like cause—a deficient quantity of blood in the brain. Along with this languor there is a general obtuseness of all the senses, which increases the separation of the mind from the external world, already initiated by thephysical condition of the brain. The liveliest scenes cease to engage the attention, and the most exciting conversation no longer interests. For a time, indeed, such circumstances may dissipate the inclination for sleep, but eventually nature obtains the ascendency and consciousness is lost. Before this event there is usually yawning—a phenomenon strongly indicative of a wearied attention; the head nods and droops upon the breast, and the body assumes that position which is most conducive to ease, comfort, and entire muscular inactivity.
The order in which the muscles lose their power is in general well marked, and bears a distinct relation, as Cabanis[30]has pointed out, to the importance of their functions. Thus, the muscles which move the arms and legs become relaxed before those which support the head, and the latter before those which maintain the erectness of the back. This, however, is not always the case, for, as we have already seen, individuals will occasionally walk, and keep their position on horseback, while in a sound sleep, and all of us have seen persons slumbering in church, their heads dropping on their breasts, but yet firmly holding their prayer-books in their hands under the pretense of going through the services.
As regards the senses, the sight is of course the first to be lost in ordinary cases—the closure of theeyelids interposing a physical obstruction to the entrance of light. Even when the eyelids have been removed, or from disease cannot be closed, the sight, nevertheless, is the first of the special senses to be abolished. Some animals, as the hare for example, do not shut the eyes when asleep; but even in them the ability to see disappears before the action of the other senses is suspended.
These latter are not altogether abolished during sleep; their acuteness is simply lessened. Taste is the first to fade, and then the smell; hearing follows, and touch yields last of all, and is most readily re-excited. To awake a sleeping person, impressions made upon the sense of touch are more effectual than attempts to arouse through any of the other senses; the hearing comes next in order, smell next, then taste, and the sight is the last of all in capacity for excitation.
During sleep the respiration is slower, deeper, and usually more regular than during wakefulness. The vigor of the process is lessened, and therefore there is a diminution of the pulmonary exhalations. In all probability, also, the ciliated epithelium which lines the air-passages functionates with reduced activity. Owing to this circumstance and to the general muscular torpor which prevails, mucus accumulates in the bronchial tubes and requires to be expectorated on awaking.
The circulation of the blood is rendered slower. The heart beats with more regularity, but withdiminished force and frequency. As a consequence the blood is not distributed to distant parts of the body so thoroughly and rapidly as during wakefulness, and accordingly the extremities readily lose their heat. Owing to the reduction in the activity of the respiratory and circulatory functions, the temperature of the whole body falls, and coldness of the atmosphere is less easily resisted.
The functions of the several organs concerned in digestion have their activity increased by sleep. The blood which leaves the brain, goes, as Durham has shown, to the stomach and other abdominal viscera, and hence the quantities of the digestive juices are augmented, and the absorption of the nutritious elements of the food is promoted.
The urine is excreted in less quantity during sleep than when the individual is awake and engaged in mental or physical employment, because the wear and tear of the system is at its minimum.
The perspiration is likewise reduced in amount by sleep. In warm weather, however, the effort to go to sleep often causes an increase in the quantity of this excretion, just as would any other mental or bodily exertion. This circumstance has led some writers to a conclusion the reverse of that just expressed. Others, again, have accepted the doctrine of Sanctorius on this point without stopping to inquire into its correctness. This author,[31]amongother aphorisms relating to sleep, gives the following:
“Undisturbed sleep is so great a promoter of perspiration, that in the space of seven hours, fifty ounces of the concocted perspirable matter do commonly exhale out of strong bodies.
“A man sleeping the space of seven hours is wont, insensibly, healthfully, and without any violence, to perspire twice as much as one awake.”
The observations of Sanctorius with his weighing chair led to a good many important results, but they were inexact so far as the function of the skin was concerned, in that they made no division between the loss by this channel and that which takes place through the lungs, for by perspiration in the above quotations he means not only the exhalation from the skin, but the products of respiration—aqueous vapor, carbonic acid, etc. His apparatus was, besides, very imperfect, and could not possibly have given the delicate indications which the subject requires.
Whether the condition of sleep promotes the absorption of morbid growths and accumulations of fluids is very doubtful. Macnish[32]contends that it does, buta priorireasoning would rather lead us to an opposite conclusion. Deficiencies are probably more rapidly made up during sleep than during wakefulness, and thus ulcers heal with more rapidity, owing to the increased formation of granulationswhich takes place; but the removal of tumors, etc. by natural process involves the operation of forces the very opposite of those concerned in reparation, and observation teaches us that sleep is a condition peculiarly favorable to the deposition of the materials constituting morbid growths. Some writers have alleged that sleep accelerates the absorption of dropsical effusions, but the disappearance of such accumulations during the condition in question is clearly due to the mechanical causes depending upon the position of the body.
It has also been asserted that there is an exaltation of the sexual feeling during sleep. It is difficult to arrive at any very definite conclusion on this point, but it is probable that here again the position of the body conjoined with the heat of the bed has much to do in producing the erotic manifestations occasionally witnessed. Every physician who has had much to do with cases of the kind knows that sleeping upon the back, by which means the blood gravitates to the generative organs and to the lower part of the spinal cord, will often give rise to seminal emissions with or without erotic dreams, and that such occurrences may generally be prevented by the individual avoiding the dorsal decubitus and resting upon one side or the other while asleep. The erections which the generality of healthy men experience in the morning before rising from bed are likewise due to the fact that the recumbent posture favors the flow of blood to the penis andtesticles. Such erections are usually unaccompanied by venereal desire.
The ganglionic nervous system and the spinal cord continue in action during sleep, though generally with somewhat diminished power and sensibility. The reflex faculty of the latter organ is still maintained, and thus various movements are executed without the consciousness of the brain being awakened. Somnambulism is clearly a condition of exaltation in the functions of the spinal cord without the controlling influence of the cerebrum being brought into action. But, aside from this rather abnormal phenomenon, there are others which are entirely within the range of health, and which show that the spinal cord is awake, even though the sleep be most profound. Thus, for instance, if the position of the sleeper becomes irksome, it is changed; if the feet become cold, they are drawn up to a warmer part of the bed; and cases are recorded in which individuals have risen from bed and emptied a distended bladder without awaking.
The instances brought forward in a previous chapter of persons riding on horseback and walking during sleep show the activity of the spinal cord, and not that the will is exercised; and Cabanis[33]is wrong in the view which he gives of such phenomena in the following extract.
Speaking of cases like those just referred to, he says:
“These rare instances are not the only ones in which movements are observed produced during sleep by that portion of the will which is awake; for it is by virtue of certain direct sensations that a sleeping man moves his arm to brush away the flies from his face, that he draws the cover around him so as to envelop himself carefully, or that he turns in bed till he has found a comfortable position. It is the will which during sleep maintains the contraction of the sphincter of the bladder, notwithstanding the effort of the urine to escape.”
Such examples as the above we now know to be instances of reflex action, and as not, therefore, being due to the exercise of the will.
Sleep favors the occurrence of certain pathological phenomena. Thus individuals affected with hæmorrhoids have the liability to hemorrhage increased when they are asleep. Several instances of the kind have come under my notice. In one the patient lost so large a quantity of blood that syncope ensued and might have terminated fatally had not his condition been accidentally discovered. Bleeding from the lungs is also more apt to occur during sleep in those who are predisposed to it. Darwin states that a man of about fifty years of age, subject to hæmorrhoids, was also attacked with hæmoptysis three consecutive nights at about the same hour—two o’clock—being awakened thereby from a state of very profound sleep. He was advised to suffer himself to be roused at one o’clock, and to leave his bed at thathour. He did so with the result not only of entirely breaking up the hemorrhagic disposition, but also of curing himself of very violent attacks of headache, to which he had been subject for many years.
Epileptic fits are also more liable to occur during sleep than at other times, a fact not always susceptible of easy explanation. In a case of epilepsy now under my charge, this proclivity is so well marked that the patient, a lady, scarcely ever goes to sleep without being attacked. Her face becomes exceedingly pale just before the fit, and if then seen the paroxysm can be entirely prevented by waking her. She is never attacked at other times, and I am trying, with excellent results thus far, the plan of making her sleep altogether during the day and of waking her as soon as her face becomes pallid. It is probable that the fits in her case are due to a diminished amount of blood in the brain, and this supposition is strengthened by the additional fact that bromide of potassium—a substance which, as I have shown, lessens the amount of intracranial blood—invariably rendered her paroxysms more frequent and severe.
Sleep predisposes to attacks of gout in those who have the gouty diathesis, and likewise favors exacerbations in several other diseases which it is scarcely necessary to allude to specifically. The accession of fever toward night, and the increase which takes place in pain due to inflammation are generally associated with the approach of night, and have no direct relation with sleep.
Certain other morbid phenomena, such as somnambulism and nightmare, which have a necessary relation with sleep, will be more appropriately considered in another place.
On the other hand, sleep controls the manifestations of several diseases, especially those which are of a convulsive or spasmodic character. Thus the paroxysms of chorea cease during sleep, as do likewise the spasms of tetanus and hydrophobia. Headache is also generally relieved by sleep, though occasionally it is aggravated.
THE STATE OF THE MIND DURING SLEEP.
We have seen that though during sleep the operations of the senses are entirely suspended as regards the effects of ordinary impressions, the purely animal functions of the body continue in action. The heart beats, the lungs respire, the stomach, the intestines, and their accessory organs digest, the skin exhales vapor, and the kidneys secrete urine. With the central nervous system, however, the case is very different; for while some parts retain the property of receiving impressions or developing ideas, others have their actions diminished, exalted, perverted, or altogether arrested.
In the first place, there is, undoubtedly, during sleep, a general torpor of the sensorium, which prevents the appreciation of the ordinary excitations made upon the organs of the special senses. So far as the nerves themselves are concerned, there is no loss of their irritability or conducting power, and the impressions made upon them are, accordingly, perfectly well conveyed to the brain. The suspension of the operations of the senses is not therefore due to any loss of function in the optic nerve, theauditory nerve, the olfactory nerve, the gustatory nerve, or the cranial or spinal nerves concerned in the sense of touch, but solely to the inability of the brain to take cognizance of the impressions conveyed to it. In regard to the cause of this torpor, I have given my views in a previous chapter.
Now it must not be supposed that because mild excitations transmitted by the nerves of the special senses are incapable of making themselves felt, that therefore the brain is in a state of complete repose throughout all its parts. So far from such a condition existing, there are very decided proofs that several faculties are exercised to a degree almost equaling that reached during wakefulness, and we know that if the irritations made upon the senses be sufficiently strong, the braindoesappreciate them, and the sleep is broken. This ability to be readily roused through the senses constitutes one of the main differences between sleep and stupor, upon which stress has been already laid.
Relative to the different faculties of the mind as affected by sleep, great variations are observed. It has been thought by some authors that several of them are really exalted above the standard attained during wakefulness, but this is probably a wrong view. The predominance which one or two mental qualities apparently assume is not due to any absolute exaggeration of power, but to the suspension of the action of other faculties, which, when we are not asleep, exercise a governing or modifying influence.Thus, for instance, as regards the imagination,—the faculty of all others which appears to be most increased,—we find, when we carefully study its manifestations in our own persons, that although there is often great brilliancy in its vagaries, that uncontrolled as it is by the judgment, the pictures which it paints upon our minds are usually incongruous and silly in the extreme. Even though the train of ideas excited by this faculty when we are asleep be rational and coherent, we are fully conscious on awaking that we are capable of doing much better by intentionally setting the brain in action and governing it by our will and judgment.
Owing to the fact that these two faculties of the mind are incapable of acting normally during sleep, the imagination is left absolutely without controlling influence. Indeed, we are often cognizant in those dreams which take place when we are half awake, of an inability to direct it. The impressions which it makes upon the mind are, therefore, intense, but of very little durability. Many stories are told of its power—how problems have been worked out, poetry and music composed, and great undertakings planned; but if we could get at the truth, we should probably find that the imagination of sleep had very little to do with the operations mentioned. Indeed, it is doubtful if the mind of a sleeping person can originate ideas. Those which are formed are, as Locke[34]remarks, almost invariably made up of thewaking man’s ideas, and are for the most part very oddly put together; and we are all aware how commonly our dreams are composed of ideas, or based upon events which have recently occurred to us.
In the previous section to the one just quoted, Locke refers to the exaggeration of ideas which form so common a feature of our mental actions during sleep. “It is true,” he says, “we have sometimes instances of perception while we are asleep, and retain the memory of those thoughts; but how extravagant and incoherent for the most part they are, how little conformable to the perfection and order of a rational being, those acquainted with dreams need not be told.”
And yet many remarkable stories are related, which tend to show the high degree of activity possessed by the mind during sleep. Thus it is said of Tartini,[35]a celebrated musician of the eighteenth century, that one night he dreamed he had made a compact with the devil, and bound him to his service. In order to ascertain the musical abilities of his servitor, he gave him his violin, and commanded him to play a solo. The devil did so, and performed so admirably that Tartini awoke with the excitement produced, and seizing his violin, endeavored to repeatthe enchanting air. Although he was unable to do this with entire success, his efforts were so far effectual that he composed one of the most admired of his pieces, which in recognition of its source he called the “devil’s sonata.”
Coleridge gives the following account of the composition of the fragment, Kubla Khan:
“In the summer of 1797, the author, then in ill health, had retired to a lonely farm-house, between Perlock and Linton, on the Exmoor confines of Somerset and Devonshire. In consequence of a slight indisposition, an anodyne had been prescribed, from the effects of which he fell asleep in his chair at the moment that he was reading the following sentence, or words of the same substance, in Purchas’s Pilgrimage: ‘Here the Khan Kubla commanded a palace to be built, and a stately garden thereunto. And thus ten miles of fertile ground were inclosed with a wall.’ The author continued for about three hours in a profound sleep, at least of the external senses, during which time he had the most vivid confidence that he could have composed not less than from two to three hundred lines, if that, indeed, can be called composition, in which all the images rose up before him asthingswith a parallel production of the corresponding expression without any sensation or consciousness of effort. On awaking, he appeared to himself to have a distinct recollection of the whole; and taking his pen, ink, and paper, instantly and eagerly wrote down the linesthat are here preserved. At this moment he was unfortunately called out by a person on business from Perlock, and detained by him above an hour; and on his return to his room, found to his no small surprise and mortification, that though he still retained some vague and dim recollection of the general purport of the vision, yet with the exception of some eight or ten scattered lines and images, all the rest had passed away like the images on the surface of a stream into which a stone had been cast, but, alas! without the after restoration of the latter.”
Dr. Cromwell,[36]citing the above instance of poetic inspiration during sleep, states that, having like Coleridge taken an anodyne during a painful illness, he composed the following lines of poetry, which he wrote down within half an hour after awaking. These lines, though displaying considerable imagination, are not remarkable for any other quality.
“Lines composed in sleep on the night of January 9th, 1857.
“Scene.—Windsor Forest.“At a vista’s end stood the queen one dayRelieved by a sky of the softest hue;It happen’d that a wood-mist risen new,Had made that white which should have been blue.A sunbeam sought on her form to play;It found a nook in the bowery nave,Through which with its golden stem to laveAnd kiss the leaves of the stately treesThat fluttered and rustled beneath the breeze;But it touched not her, to whom ’twas givenTo walk in a white light pure as heaven.”
“Scene.—Windsor Forest.
“At a vista’s end stood the queen one dayRelieved by a sky of the softest hue;It happen’d that a wood-mist risen new,Had made that white which should have been blue.A sunbeam sought on her form to play;It found a nook in the bowery nave,Through which with its golden stem to laveAnd kiss the leaves of the stately treesThat fluttered and rustled beneath the breeze;But it touched not her, to whom ’twas givenTo walk in a white light pure as heaven.”
In the last two of these instances it is impossible to say whether the individuals were really asleep or not, as the opium or other narcotic taken is a very disturbing factor in both conditions, and doubtless was the exciting cause of the activity in the imagination. No more graphic account of the effects of opium in arousing the imagination to its highest pitch has been written than that given by De Quincey.[37]He says:
“At night when I lay awake in bed, vast processions passed along in mournful pomp; friezes of never-ending stories, that to my feelings were as sad and solemn as if they were stories drawn from times before Œdipus or Priam, before Tyre, before Memphis. And at the same time a corresponding change took place in my dreams; a theater seemed suddenly opened and lighted up within my brain, which presented nightly spectacles of more than earthly splendor.” And then, after referring to the various scenes of architectural magnificence, and of beautiful women which his imagination conceived, and which forcibly recalls to our minds the poetical effusionsof Coleridge and Cromwell, he gives the details of another dream, in which he heard music. “A music of preparation, of awakening suspense; a music like the opening of the Coronation Anthem, and which likethatgave the feeling of a vast march, of infinite cavalcades filing off, and the tread of innumerable armies.”
In reference to this subject, Dr. Forbes Winslow[38]relates the following interesting case:
“A feeble, sensitive lady, suffering from a uterine affection, writes to us as follows concerning the influence of three or four sixteenth-of-a-grain doses of hydrochlorate of morphia: ‘After taking a few doses of morphia, I felt a sensation of extreme quiet and wish for repose, and on closing my eyes, visions, if I may so call them, were constantly before me, and as constantly changing in their aspect: scenes from foreign lands; lovely landscapes, with tall, magnificent trees covered with drooping foliage, which was blown gently against me as I walked along. Then in an instant I was in a besieged city filled with armed men. I was carrying an infant, which was snatched from me by a soldier and killed upon the spot. A Turk was standing by with a scimitar in his hand, which I seized, and attacking the man who had killed the child, I fought most furiously with him and killed him. Then I was surrounded, madeprisoner, carried before a judge and accused of the deed; but I pleaded my own cause with such a burst of eloquence (which, by-the-by, I am quite incapable of in my right mind) that judge, jury, and hearers acquitted me at once. Again, I was in an Eastern city visiting an Oriental lady, who entertained me most charmingly. We sat together on rich ottomans, and were regaled with supper and confectionery. Then came soft sounds of music at a distance, while fountains were playing and birds singing, and dancing girls danced before us, every movement being accompanied with the tinkling of silver bells attached to their feet. But all this suddenly changed, and I was entertaining the Oriental lady in my own house, and in order to please her delicate taste, I had everything prepared as nearly as possible after the fashion with which she had so enchanted me. She, however, to my no small surprise, asked for wine, and took not one, two, or three glasses, but drank freely, until at last I became terrified that she would have to be carried away intoxicated. While considering what course I had better adopt, several English officers came in, and she at once asked them to drink with her, which so shocked my sense of propriety that the scene changed and I was in darkness.
“‘Then I felt that I was formed of granite, and immovable. Suddenly a change came again over me, and I found that I consisted of delicate and fragile basket-work. Then I became a danseuse,delighting an audience and myself by movements which seemed barely to touch the earth. Presently beautiful sights came before me, treasures from the depth of the sea, gems of the brightest hues, gorgeous shells, coral of the richest colors, sparkling with drops of water, and hung with lovely seaweed. My eager glances could not take in half the beautiful objects that passed before me during the incessant changes the visions underwent. Now I was gazing upon antique brooches and rings from buried cities; now upon a series of Egyptian vases; now upon sculptured wood-work blackened by time; and lastly I was buried amid forests of tall trees, such as I had read of but never seen.
“‘The sights that pleased me most I had power to a certain extent to prolong, and those that displeased me I could occasionally set aside, and I awoke myself to full consciousness once or twice while under the influence of the morphia by an angry exclamation that I would not have it. I did not once lose my personal identity.’
“The lady almost invariably suffers more or less from hallucinations of the foregoing character, if it becomes necessary to administer to her an opiate: and on analyzing her visions, she can generally refer the principal portions of them, notwithstanding their confusion and distortion, to works that she has recently read.”
Opium, in certain doses, increases the amount of blood in the brain, and this induces a condition verydifferent from that of sleep. In this fact we have an explanation of the activity of the imagination as one of its prominent effects. That Coleridge should have composed the Kubla Khan under its influence is in nowise remarkable. It is probable, however, that the full influence of his mind was exerted upon it after he awoke to consciousness, and that the wild fancies excited by the opiate, and based upon what he had been previously reading, formed the substratum of his conceptions. In any event, the ideas contained in this fragment are no more fanciful than those which occurred to De Quincey and the lady whose case has just been recorded, nor are they more impressively related.
The imagination may therefore be active during sleep, but we have no authentic instance on record that it has, unaided by causes which exercise a powerful influence over the intracranial circulation, led to the production of any ideas which could not be excelled by the individual when awake. Perhaps the most striking case in opposition to this opinion is one detailed by Abercrombie,[39]who says:
“The following anecdote has been preserved in a family of rank in Scotland, the descendants of a distinguished lawyer of the last age. This eminent person had been consulted respecting a case of great importance and much difficulty, and he had been studying it with intense anxiety and attention.After several days had been occupied in this manner, he was observed by his wife to rise from his bed in the night and go to a writing-desk which stood in the bed-room. He then sat down and wrote a long letter, which he put carefully by in the desk and returned to bed. The following morning he told his wife that he had had a most interesting dream; that he had dreamt of delivering a clear and luminous opinion respecting a case which had exceedingly perplexed him, and that he would give anything to recover the train of thought which had passed before him in his dream. She then directed him to the writing-desk, where he found the opinion clearly and fully written out, and which was afterwards found to be perfectly correct.”
It is probable that this gentleman was actually awake when he arose from the bed and wrote the paper referred to, and that in the morning he mistook the circumstance for a dream. It is not at all uncommon for such errors to be committed, especially under the condition of mental anxiety and fatigue. A gentleman informed me only a short time since that going to bed after a very exciting day he thought the next morning that he had dreamed of a fire occurring in the vicinity of his house. To his surprise his wife informed him that the supposed dream was a reality, and that he had got up to the window, looked at the fire, conversed with her concerning it, and that he was at the time fully awake.
Brierre de Boismont[40]relates the following instance, which is to the same effect:
“In a convent in Auvergne, an apothecary was sleeping with several persons; being attacked with nightmare, he charged his companions with throwing themselves on him and attempting to strangle him. They all denied the assertion, telling him that he had passed the night without sleeping, and in a state of high excitement. In order to convince him of this fact, they prevailed on him to sleep alone in a room carefully closed, having previously given him a good supper, and even made him partake of food of a flatulent nature. The paroxysm returned; but, on this occasion, he swore that it was the work of a demon, whose face and figure he perfectly described.”
That the imagination may in its flights during sleep strike upon fancies which are subsequently developed by the reason into lucid and valuable ideas, is very probable. It would be strange if from among the innumerable absurdities and extravagancies to which it attains something fit to be appropriated by the mind should not occasionally be evolved, and thus there are many instances mentioned of the starting-point of important mental operations having been taken during sleep. Some of these may be based upon fact, but the majority are probably ofthe class of those just specified, or occurred at an age of the world when a belief in the supernatural exercised a greater power over men’s minds than it does at the present day. Among the most striking of them are the following:
Galen declares that he owed a great part of his knowledge to the revelations made to him in dreams. Whether this was really the case or not we can in a measure determine by recalling the fact that he was a believer in the prophetic nature of dreams, and states that a man having dreamt that one of his legs was turned into stone, soon afterward became paralytic in this limb, although there was no evidence of approaching disease. Galen also conducted his practice by dreams, for an athlete, having dreamt that he saw red spots, and that the blood was flowing out of his body, was supposed by Galen to require blood-letting, which operation was accordingly performed.
It has been said[41]that the idea of theDivina Commediaoccurred to Dante during sleep. There is nothing at all improbable in this supposition, though I have been unable to trace it to any definite source.
Cabanis[42]states that Condillac assured him that often during the course of his studies he had to leave them unfinished in order to sleep, and that onawaking he had more than once found the work upon which he was engaged brought to a conclusion in his brain.
These were clearly instances of “unconscious cerebration” of that power which the brain possesses to work out matters which have engaged its attention, without the consciousness of the individual being aroused to a knowledge of the labor being performed. It is not unlikely that this kind of mental activity goes on to some extent during sleep, but as it is of such a character that the mind does not take cognizance of its operations, I do not see how the exact period of its performance can be ascertained.
Jerome Cardan believed that he composed books while asleep, and his case is often adduced as an example of the height to which the imagination can attain during sleep. But this great man was superstitious to an extreme degree; he believed that he had a familiar spirit, from whom he received intelligence, warnings, and ideas, and asserted that when awake he frequently saw long processions of men, women, animals, trees, castles, instruments of various kinds and many figures, different from anything in this world. His evidence relative to his compositions and mathematical labors when asleep is not therefore of a trustworthy character.
As regards the memory in sleep, it is undoubtedly exercised to a considerable extent. In fact, whatever degree of activity the mind may then exhibitis based upon events the recollection of which has been retained. But there is more or less error mingled with a small amount of truth. The unbridled imagination of the sleeper so distorts the simplest circumstances as to render their recognition a matter of no small difficulty, and thus it scarcely if ever happens that events are reproduced during sleep exactly as they occurred or as they would be recalled by the mind of the individual when awake. Frequently, also, recent events which have made a strong impression on our minds are forgotten, as when we dream of seeing and conversing with persons not long dead.
And yet it has sometimes happened that incidents or knowledge which had long been overlooked or forgotten, or which could not be remembered by any effort during wakefulness have been strongly depicted during sleep. Thus Lord Monboddo[43]states that the Countess de Laval, a woman of perfect veracity and good sense, when ill, spoke during sleep in a language which none of her attendants understood, and which even she was disposed to regard as gibberish. A nurse detected the dialect of Brittany; her mistress had spent her childhood in that province, but had lost all recollection of the Breton tongue, and could not understand a word of what she said in her dreams. Her utterancesapplied, however, exclusively to the experience of childhood, and were infantile in structure.
Abercrombie[44]relates the case of a gentleman who was very fond of the Greek language, and who, in his youth, had made considerable progress in it. Subsequently being engaged in other pursuits, he so entirely forgot it that he could not even read the words; often, however, in his dreams he read Greek works, which he had been accustomed to use at college, and had a most vivid impression of fully understanding them.
Many other instances of the action of memory during sleep might be brought forward, but the subject will be more appropriately considered in the chapter on dreams.
The judgment is frequently exercised when we are asleep, but almost invariably in a perverted manner. In fact we scarcely ever estimate the events or circumstances which appear to transpire in our dreams at their real value, and very rarely from correct conceptions of right and wrong. High-minded and honorable men do not scruple during sleep to sanction the most atrocious acts, or to regard with complaisance ideas which, in their waking moments, would fill them with horror. Delicate and refined women will coolly enter upon a career of crime, and the minds of hardened villains are filled with the most elevated and noblesentiments. The deeds which we imagine we perform in our sleep are generally inadequate to or in excess of what the apparent occasion requires, and we lose so entirely the ideas of probability and possibility, that no preposterous vision appears otherwise than as perfectly natural and correct. Thus, a physician dreamed that he had been transformed into a monolith which stood grandly and alone in the vast desert of the Sahara, and had so stood for ages, while generation after generation wasted and melted away around him. Although unconscious of having organs of sense, this column of granite saw the mountains growing bald with age, the forests drooping with decay, and the moss and ivy creeping around its crumbling base.[45]
But, although in this instance there was some conception of time, as shown in the association of the evidences of decay with the lapse of years, there is in general no correct idea on this subject. Without going into details which more appropriately belong to another division of this treatise, I quote the following remarkable example from the essay last cited. It appeared originally in a biographical sketch of Lavalette, published in theRevue de Paris, and is related by Lavalette as occurring to him while in prison:
“One night, while I was asleep, the clock of thePalais de Justice struck twelve and awoke me. I heard the gate open to relieve the sentry, but I fell asleep again immediately. In this sleep I dreamt that I was standing in the Rue St. Honore. A melancholy darkness spread around me; all was still; nevertheless, a slow and uncertain sound soon arose. All of a sudden, I perceived at the bottom of the street and advancing toward me, a troop of cavalry,—the men and horses, however, all flayed. The men held torches in their hands, the red flames of which illuminated faces without skin, and bloody muscles. Their hollow eyes rolled fearfully in their sockets, their mouths opened from ear to ear, and helmets of hanging flesh covered their hideous heads. The horses dragged along their own skins in the kennels which overflowed with blood on all sides. Pale and disheveled women appeared and disappeared at the windows in dismal silence; low inarticulate groans filled the air, and I remained in the street alone petrified with horror, and deprived of strength sufficient to seek my safety in flight. This horrible troop continued passing along rapidly in a gallop, and casting frightful looks upon me. Their march continued, I thought, for five hours, and they were followed by an immense number of artillery wagons full of bleeding corpses, whose limbs still quivered; a disgusting smell of blood and bitumen almost choked me. At length the iron gates of the prison, shutting with great force, awoke me again. I made my repeater strike; itwas no more than midnight, so that the horrible phantasmagoria had lasted no more than two or three minutes—that is to say, the time necessary for relieving the sentry and shutting the gate. The cold was severe and the watchword short. The next day the turnkey confirmed my calculations. I, nevertheless, do not remember one single event in my life the duration of which I have been able more exactly to calculate, of which the details are deeper engraven on my memory, and of which I preserve a more perfect consciousness.”
No instance can more strikingly exemplify aberration of the faculty of judgment than the above. There was no astonishment felt with the horror experienced, but all the impossible events which appeared to be transpiring were accepted as facts, which might have taken place in the regular order of nature.
An important question connected with the exercise of judgment is: does the dreamer know that he is dreaming? Some authors assert that this knowledge is possible, others that it is not. The following account is interesting, and I therefore transcribe it, especially as it has not to my knowledge been heretofore published in this country.
In a letter to the Rev. William Gregory, Dr. Thomas Reid[46]says:
“About the age of fourteen, I was almost every night unhappy in my sleep from frightful dreams. Sometimes hanging over a frightful precipice and just ready to drop down; sometimes pursued for my life and stopped by a wall or by a sudden loss of all strength; sometimes ready to be devoured by a wild beast. How long I was plagued by such dreams I do not now recollect. I believe it was for a year or two at least; and I think they had quite left me before I was fifteen. In those days I was much given to what Mr. Addison in one of his Spectators calls castle-building, and, in my evening solitary walk, which was generally all the exercise I took, my thoughts would hurry me into some active scene, where I generally acquitted myself much to my own satisfaction, and in these scenes of imagination I performed many a gallant exploit. At the same time, in my dreams, I found myself the most arrant coward that ever was. Not only my courage, but my strength failed me in every danger, and I often rose from my bed in the morning in such a panic that it took some time to get the better of it. I wished very much to get free of these uneasy dreams, which not only made me unhappy in sleep, but often left a disagreeable impression in my mind for some part of the following day. I thought it was worth trying whether it was possible to recollect that it was all a dream, and that I was in no real danger. I often went to sleep with my mind as strongly impressed as I could with this thoughtthat I never in my lifetime was in any real danger, and that every fright I had was a dream. After many fruitless endeavors to recollect this when the danger appeared, I effected it at last, and have often, when I was sliding over a precipice into the abyss, recollected that it was all a dream, and boldly jumped down. The effect of this commonly was, that I immediately awoke. But I awoke calm and intrepid, which I thought a great acquisition. After this my dreams were never very uneasy, and, in a short time, I dreamed not at all.”
Beattie[47]states that he once dreamed that he was walking on the parapet of a high bridge. How he came there he did not know, but recollecting that he was not given to such pranks, he began to think it might all be a dream, and, finding his situation unpleasant, and being desirous to get out of it, threw himself headlong from the height, in the belief that the shock of the fall would restore his senses. The event turned out as he anticipated.
Aristotle also asserts that when dreaming of danger, he used to recollect that he was dreaming, and that he ought not to be frightened.
A still more remarkable narration is that of Gassendi,[48]which he thus relates as occurring to himself:
“A good friend of mine, Louis Charambon, judge of the criminal court at Digne, had died of the plague. One night, as I slept, I seemed to see him; I stretched out my arms toward him, and said, ‘Hail thou who returnest from the place of the dead!’ Then I stopped, reflecting in my dream as follows: ‘One cannot return from the other world; I am doubtless dreaming; but if I dream, where am I? Not at Paris, for I came last to Digne. I am then at Digne, in my house, in my bedroom, in my bed.’ And then, as I was looking for myself in the bed, some noise, I know not what, awoke me.”
In all these and like instances, it is very probable the individuals were much more awake than asleep, for certainly the power to judge correctly is not exercised in dreams, involving even the most incongruous impossibilities. As Dendy[49]says, “if weknowthat we are dreaming, the faculty of judgment cannot be inert, and the dream would be known to be a fallacy.” There would therefore be no occasion for any such management of it as that made use of by Reid and Beattie, or for the recollection of Aristotle. The dream and the correction of it by the judgment would go together and there would be no self-deception at all—not even for an instant. Dreams would accordingly be impossible. The essential feature of mental activity during sleep, absolute freedom of the imagination, would not exist.
Relative to Gassendi’s case, it is impossible to believe that he was fully asleep, and the fact that he was awakened by some noise, the nature of which was unrecognized, and which was therefore probably slight, tends to support this view. Moreover, although he was, as he thought, enabled to detect the fallacy of his dream in one respect, his judgment was altogether at fault in others. Thus he had great difficulty in making out where he was, and actually so far lost all idea of his identity with the person dreaming as to look for himself in his own bed! Certainly an individual whose judgment was thus much deranged would scarcely be able to reason correctly as to the fact of his dreaming or not, or to question the possibility of the dead returning to this world.
My opinion therefore is, that during sleep the power of bringing the judgment into action is suspended. We do not actually lose the power of arriving at a decision, but we cannot exert the faculty of judgment in accordance with the principles of truth and of correct reasoning. An opinion may therefore be formed during sleep, but it is more likely to be wrong than right, and no effort that we can make will enable us to distinguish the false from the true, or to discriminate between the possible and the impossible.
That faculty of the mind—the judgment—which when we are awake is pre-eminently our guide, can no longer direct us aright. The stores of experiencego for naught, and the mind accepts as truth whatever preposterous thought the imagination presents to it. We are not entirely rendered incapable of judging, as some authors assert, but the power to perceive the logical force of circumstances, to take them at their true value and to eliminate error from our mental processes, is altogether arrested, and we arrive at absurd conclusions from impossible premises.
But there is no doubt that at times the faculty of judgment is suspended as regards some parts of our mental operations during sleep, and this, to such an extent, that we are like Gassendi in the case quoted, not capable of recognizing our own individuality. Thus it is related of Dr. Johnson, that he had once in a dream a contest of wit with some other person, and that he was very much mortified by imagining that his opponent had the better of him. “Now,” said he, “one may mark here the effect of sleep in weakening the power of reflection; for had not my judgment failed me, I should have seen that the wit of this supposed antagonist, by whose superiority I felt myself depressed, was as much furnished by me as that which I thought I had been uttering in my own character.”
Van Goens dreamt that he could not answer questions to which his neighbor gave correct responses.
An interesting case, in which the judgment was still more at fault, has recently come to my knowledge.
Mrs. C. dreamed that she was Savonarola, and that she was preaching to a vast assembly in Florence. Among the audience was a lady whom she at once recognized to be her own self. As Savonarola, she was delighted at this discovery, for she reflected that she was well acquainted with all Mrs. C.’s peculiarities and faults of character, and would, therefore, be enabled to give special emphasis to them in the sermon. She did this so very effectively that Mrs. C. burst into a torrent of tears, and, with the emotion thus excited, the lady awoke. It was some time before she was able to disentangle her mixed up individualities. When she became fully awake she perceived that the arguments she had employed to bring about the conversion of herself were puerile in the extreme, and were directed against characteristics which formed no part of her mental organization, and against offenses which she had not committed.
Macario[50]makes the following apposite remarks on the point under consideration. Referring to the preposterous nature of many dreams, he says:
“It is astonishing that all these fantastical and impossible visions seem to us quite natural, and excite no astonishment. This is because the judgment and reflection having abdicated, no longer control the imagination nor co-ordinate the thoughts which rush tumultuously through the brain of the sleeper, combined only by the power of association.
“When I say that the judgment and reflection abdicate, it should not be inferred that they are abolished and no longer exist, for the imagination could not, unaided by the reason, construct the whimsical and capricious images of dreams.”
Relative to the power to work out, during sleep, problems involving long and intricate mental processes, I have already expressed my opinion adversely. In this view, I am not alone. Rosenkranz,[51]whose contributions to psychological science cannot be overestimated, and whose clear and powerful understanding has rarely been excelled, has pointed out how such operations of the understanding are impossible; for, as he remarks, intellectual problems cannot be solved during sleep, for such a thing as intense thought, accompanied by images, is unknown, whilst dreams consist of a series of images connected by loose and imperfect reasoning. Feuchtersleben,[52]referring with approval to this opinion of Rosenkranz, says that he recollects perfectly having dreamt of such problems, and being happy in their solution, endeavored to retain them in his memory; he succeeded, but discovered, on awaking, that they were quite unmeaning, and could only have imposed upon a sleeping imagination.
Müller[53]says:
“Sometimes we reason more or less correctly in dreams. We reflect on problems and rejoice in their solution. But on awaking from such dreams, the seeming reasoning is frequently found to have been no reasoning at all, and the solution of the problem over which we had rejoiced, to be mere nonsense. Sometimes we dream that another person proposes an enigma; that we cannot solve it and that others are equally incapable of doing so; but that the person who proposed it, himself gives the explanation. We are astonished at the solution we had so long labored in vain to find. If we do not immediately awaken and afterwards reflect on this proposition of an enigma in our dream, and on its apparent solution, we think it wonderful; but if we awake immediately after the dream, and are able to compare the answer with the question, we find that it was mere nonsense.”
And in regard to the knowledge that we are dreaming, the same author[54]observes that:
“The indistinctness of the conception in dreams is generally so great that we are not aware that we dream. The phantasms which are perceived really exist in our organs of sense. They afford, therefore, in themselves as strong proof of the actualexistence of the objects they represent, as our own perceptions of real external objects in the waking state; for we know the latter only by the affections of our senses which they produce. When, therefore, the mind has lost the faculty of analyzing the impressions on our senses, there is no reason why the things which they seem to represent should be supposed unreal. Even in the waking state phantasms are regarded as real objects when they occur to persons of feeble intellect. On the other hand, when the dreaming approaches more nearly to the waking state, we sometimes are conscious that we merely dream, and still allow the dream to proceed, while we retain this consciousness of its true nature.”
Sir Benjamin Brodie,[55]in discussing the subject of wonderful discoveries made in dreams, and abstruse problems worked out, remarks that it would indeed be strange if among the vast number of combinations which constitute our dreams, there were not every now and then some having the semblance of reality; and further, that in many of the stories of great discoveries made in dreams, there is much of either mistake or exaggeration, and that if they could have been written down at the time, they would have been found to be worth little or nothing.
Another faculty exercised during sleep has beenascribed to the judgment. It is well known that many persons having made up their minds to awake at a certain hour invariably do so. I possess this power in a high degree, and scarcely ever vary a minute from the fixed time. Just as I go to bed I look at my watch and impress upon my mind the figures on the dial which represent the hour and minute at which I wish to awake. I give myself no further anxiety on the subject, and never dream of it, but I always wake at the desired moment.
Now I cannot conceive what connection the judgment has with this power. In the case of alarm clocks set to go off at a certain time, the judgment, as Jouffroy[56]asserts, may take cognizance of the impression made upon the ear, and establish the relation between it and the wish to awake at a certain time. But in cases where the awaking is the result of an idea conceived before going to sleep, and which is not subsequently recalled, the judgment cannot act, for this faculty is only exercised upon ideas which are submitted to it. The brain is, as it were, wound up like the alarm clock and set to a certain hour. When that hour arrives, an explosion of nervous force takes place, and the individual awakes.
Fosgate[57]asserts that the power of judging during sleep is probably as good as when we are awake, fordecisions are made only on the premises presented in either case, and if those in the former condition are absurd or unreasonable, the conclusion will likewise be faulty. But this is not very accurate reasoning; for it is as much the province of the judgment to determine the validity of the premises as it is to draw a conclusion from them, and if it cannot recognize the falsity or truth of propositions the irrational character of which would be readily perceived during wakefulness, there is not much to be said in favor of its power.
In fact, however, the conclusions formed in dreams are often without any logical relation with the premises. Thus, when an individual dreams, as in the instance previously quoted, that he is a column of stone, it is contrary to all experience to deduce therefrom the conclusion that he can see rocks crumbling around him, and can reflect upon the mutability of all things. The premise of his being a stone pillar being submitted to the judgment, the proper conclusion would be that he is composed of inorganic material, is devoid of life, and consequently not possessed of either sensation or understanding.
Why the judgment is not properly exercised during sleep we do not know. Dr. Philip[58]believes that in this condition ideas flow so rapidly that theyare not submitted to the full power of the judgment, and that hence the absurdity which characterizes them is not perceived. But this explanation is by no means satisfactory; for a merely swift succession of ideas is no very serious bar to correct judgment, and when the thoughts are as preposterous as those which so often occur in dreams, they present no obstacle at all to a proper estimation of them by the healthy mind. The cause probably resides in some alteration in the circulation of the blood in that part of the brain which presides over the judgment, whereby its power is suspended and the imagination left free to fill the mind with its incongruous and fantastic images.
As regards the will, we find very opposite opinions entertained relative to its activity; but no one, so far as I am aware, appears to have had correct views upon the subject. Without going into a full discussion of the views enunciated, it will be sufficient to refer to the ideas on the point in question which have been expressed by some of the most eminent philosophers and physiologists.
In the course of his remarks on sleep, Darwin[59]repeatedly alleges that during this condition the action of the will is entirely suspended; but he falls into the singular error of confounding volition with the power of motion. Thus he says:
“When by one continued posture in sleep some uneasy sensations are produced, we either gradually awake by the exertion of volition, or the muscles connected by habit with such sensations alter the position of the body; but where the sleep is uncommonly profound, and these uneasy sensations great, the disease called the incubus or nightmare is produced. Here the desire of moving the body is painfully exerted; but the power of moving it, or volition, is incapable of action till we are awake.”
In consequence of this misapprehension of the nature of the will, it is not easy to arrive at Darwin’s ideas on the subject; and the attempt is rendered still more difficult from the fact that though he repeatedly states that volition is entirely suspended during sleep, he yet in the first part of the foregoing quotation makes an individual awake by the gradual exercise of the power of the will; and then in the last part of the same paragraph asserts that volition is incapable of action till sleep is over.
Mr. Dugald Stewart[60]contends that during sleep the power of volition is not suspended, but that those operations of the mind and body which depend on volition cease to be exercised. In his opinion the will loses its influence over all our powers both of mind and body in consequence of some physical alteration in the system which weshall never probably be able to explain. To show in full the views of so distinguished a philosopher as Mr. Stewart, I quote the following extracts from his remarks on the subject:
“In order to illustrate this conclusion [the one above stated] a little further, it may be proper to remark that if the suspension of our voluntary operations in sleep be admitted as a fact, there are only two suppositions which can be formed regarding its cause. The one is that the power of volition is suspended; the other that the will loses its influence over those faculties of the mind and those members of the body which during our waking hours are subjected to its authority. If it can be shown then that the former supposition is not agreeable to fact, the truth of the latter seems to follow as a necessary consequence.
“1. That the power of volition is not suspended during sleep, appears from the efforts which we are conscious of making while in that situation. We dream, for instance, that we are in danger, and we attempt to call out for assistance. The attempt induced is in general unsuccessful, and the sounds that we emit are feeble and indistinct; but this only confirms, or rather is a necessary consequence of, the supposition that in sleep the connection between the will and our voluntary operations is disturbed or interrupted. The continuance of the power of volition is demonstrated by the effort, however ineffectual.
“In like manner, in the course of an alarming dream we are sometimes conscious of making an exertion to save ourselves by flight from an apprehended danger; but in spite of all our efforts we continue in bed. In such cases we commonly dream that we are attempting to escape and are prevented by some external obstacle; but the fact seems to be that the body is at that time not subject to the will. During the disturbed rest which we sometimes have when the body is indisposed, the mind appears to retain some power over it; but as even in these cases the motions which are made consist rather of a general agitation of the whole system than of the regular exertion of a particular member of it with a view to produce a certain effect, it is reasonable to conclude that in perfectly sound sleep the mind, although it retains the power of volition, retains no influence whatever over the bodily organs.
“In that particular condition of the system which is known by the name ofincubus, we are conscious of a total want of power over the body; and I believe the common opinion is that it is this want of power which distinguishes theincubusfrom all the other modifications of sleep. But the more probable supposition seems to be that every species of sleep is accompanied with a suspension of the faculty of voluntary motion; and that the incubus has nothing peculiar in it but this—that the uneasy sensations which are produced by the accidental posture of the body, and which we find it impossible toremove by our own efforts, render us distinctly conscious of our incapacity to move. One thing is certain, that the instant of our awaking and of our recovering the command of our bodily organs is one and the same.
“2. The same conclusion is confirmed by a different view of the subject. It is probable, as was already observed, that when we are anxious to procure sleep the state into which we naturally bring the mind approaches to its state after sleep commences. Now it is manifest that the means which nature directs us to employ on such occasions is not to suspend the powers of volition, but to suspend the exertion of those powers whose exercise depends on volition. If it were necessary that volition should be suspended before we fall asleep, it would be impossible for us by our own efforts to hasten the moment of rest. The very supposition of such efforts is absurd, for it implies a continued will to suspend the acts of the will.
“According to the foregoing doctrine with respect to the state of the mind in sleep, the effort which is produced on our mental operations is strikingly analogous to that which is produced on our bodily powers. From the observations which have been already made, it is manifest that in sleep the body is in a very inconsiderable degree, if at all, subject to our command. The vital and involuntary motions, however, suffer no interruption, but go on as when we are awake, in consequence of the operationof some cause unknown to us. In like manner it would appear that those operations of the mind which depend on our volition are suspended, while certain other operations are at least occasionally carried on. This analogy naturally suggests the idea that all our mental operations which are independent of our will may continue during sleep; and that the phenomena of dreaming may, perhaps, be produced by these, diversified in their apparent effects in consequence of the suspension of our voluntary powers.”
A very little reflection will suffice to convince the reader that Mr. Stewart has altogether mistaken the nature of sleep. There is no evidence to support his view that the body is not subject to the action of the will during sleep. No change whatever is induced by this condition in the nerves or muscles of the organism. The first are just as capable as ever of conducting the nervous fluid, and the muscles do not lose any of their contractile power. The reason why voluntary movements are not performed in sleep is simply because the will does not act; and Mr. Stewart is again wrong in asserting that volition is not then suspended. We do not will any actions when we are asleep. Weimaginewe do, and that is all. The difficulties which encompass us in sleep are, it must be recollected, purely imaginary, and the efforts we make to escape from them are likewise the products of our fancy. Herein lies the main error which Mr. Stewart hascommitted. He appears to accept the dream for a reality, and to regard the seeming volitions which occur in it as actual facts; whereas they are all entirely fictitious.
An example will serve to make this point still clearer.
Not long since I dreamed that I stood upon a very high perpendicular table-land, at the foot of which flowed a river. I thought I experienced an irresistible desire to approach the brink and to look down. Had I been awake, such a wish would have been the very last to enter my mind, for I have an instinctive dread of standing on a height. I dreamed that I threw myself on my face and crawled to the edge of the cliff. I looked down at the stream, which scarcely appeared to be as wide as my hand, so great was the altitude upon which I was placed. As I looked I felt an overpowering impulse to crawl still farther and to throw myself into the water below. I imagined that I endeavored with all my will to resist this force, which appeared to be acting by means altogether external to my organism. My efforts, however, were all in vain. I could not control my movements, and gradually I was urged farther and farther over the brink, till at last I went down into the abyss below. As I struck the water I awoke with a start. During my imaginary struggle I thought I experienced all the emotions which such an event if real would have excited, and I was painfully conscious of my utter inability to escapefrom the peril of my situation. Here were circumstances such as, according to Mr. Stewart, demonstrate the activity of volition, but at the same time show its inability to act upon the body. But clearly they show no such thing, for the imaginary volition was to refrain from crawling over a precipice which did not exist, and over which, therefore, I was not hanging. Such an act of the will if real, could not in the very nature of the real conditions of the situation have been carried out—the volition was just as imaginary as all the other circumstances of the dream.