Part 32
Gradually released from the trammels of superstition, modern philosophers have sought for more plausible explanations of the nature and causes of dreams, but perhaps without having attained a greater degree of certainty in this difficult question than our bewildered ancestors. Wolfius is of opinion that every dream originates in some sensation, yet the independent energies of the mind are sufficiently displayed in the preservation of the continued phantasms of the imagination. He maintains that none of these phantasms can prevail unless they arise from this previous sensation. De Formey is of the same opinion, and conceives that dreams are supernatural when not produced by these sensations. But of what nature are these sensations? Are they corporeal impressions received prior to sleep, and the continuances of reflection, or are they the children of an idle brain? Although it is not easy to trace an affinity between the subjects of our dreams and our previous train of thought, yet it is more than probable that dreams are excited by impressions experienced in our waking moments, and retransmitted to the sensorium, however difficult it may be to link the connexion of our ideas, and trace their imperceptible catenation. Moreover, there does not exist a necessary and regular association in the state of mind that succeeds any particular impressions. These impressions only predispose the mind to certain ideas, which act upon it with more or less subsequent energy, and with more or less irregularity, according to the condition in which the predisposing causes have left it. It has been observed that we seldom dream of the objects of our love or our antipathies. Such dreams may not be the natural results of such sentiments. We may fondly love a woman, and in our dreams transfer this soft sensation of fondness to another individual,--to a dog that fondles us, or any other pleasing object. We may have experienced fear--in a storm at sea; yet we may not dream of being tossed about in a boat, but of being mounted upon a runaway horse who hurries us to destruction, or of flying from a falling avalanche. Our mind had been predisposed by fear to receive any terrific impression, and most probably these alarming phantasms will be of a chimerical and an extravagant nature. A man who has been bitten by a dog may fancy himself in the coils of a boa-constrictor. When dreaming, the mind is in an abstracted state; but still is its reciprocal influence over the body manifest, although it is powerless on volition. Vigilance in sleep is still awake; but her assistance is of no avail until the connexion between mind and body is aroused by any alarm from external agents. It is well known that a hungry man will dream of an ample repast. A patient with a blister on his head has fancied himself scalped by Indians in all their fantastic ornaments. Somnambulism clearly proves that the mind retains its energies in sleep. Locke has justly observed that dreams are made up of the waking man's ideas, although oddly put together. Hartley is of opinion that dreams are nothing but the reveries of sleeping men, and are deducible from the impressions and ideas lately received, the state of the body, and association. I have endeavoured to explain, on the ground of the general effects of predisposition, the anomalies which so often are displayed in these associations. Of the surprising powers of the mind in somnambulism we have many instances too well authenticated to be doubted. Henricus ab Heeres was in the habit of composing in his sleep, reading aloud his productions, expressing his satisfaction, and calling to his chamber-fellow to join in the commendation. Caelius Rhodiginus when busied in his interpretation of Pliny, could only find the proper signification of the word _ectrapali_ in his slumbers. There is not the least doubt but that the mind is capable of receiving impressions of knowledge, but more particularly inspirations of genius, when the body is lulled in a state of apparent repose. Dreams have been ingeniously compared to a drama defective in the laws of unity, and unconnected by constant anachronisms. Yet certain incoherences are not frequent: Darwin has justly remarked that a woman will seldom dream that she is a soldier, and a soldier's visions will seldom expose him to the apprehensions of child-birth. Buffon has observed, "We represent to ourselves persons whom we have never seen, and such as have been dead for many years; we behold them alive and such as they were, but we associate them with actual things, or with persons of other times. It is the same with our ideas of locality; we see things not where they were, but elsewhere, where they never could have been."
Dugald Stewart has endeavoured to account for these phenomena by the doctrine that in sleep the operations of the mind are suspended, and that therefore the cause of dreams is the loss of power of the will over the mind, which in the waking condition is subject to its control. Now, if this be the case, dreams must consist of mental operations independent of the will. However, it is not the suspension of the will and of the powers of volition that alone constitutes sleep; it is the suspension of the powers of the understanding,--attention, comparison, memory, and judgment. It is in consequence of this suspension of all our active intellectual faculties that we never can _will_ during our dreams; in that state there appears to be a resistance of the powers of volition with which the mind struggles in vain, and which is expressed both by moans, and the character of the sleeper's every feature, which portrays a state of anguish and impatience. In all dreams that are not of a morbid nature, every action is passive, involuntary. This state is widely different from delirium, in which the brain is in a morbid state of excitement; and the body is more susceptible than usual of external agency, while the mind is perplexed by hallucinations of an erroneous nature.
Dr. Abercrombie considers insanity and dreaming as having a remarkable affinity when considered as mental phenomena; the impressions in the one case being more or less permanent, and transient in the other. Somnambulism he considers an intermediate state. Dreams, according to his theory, are divided into four classes: the first, when recent events and recent mental emotions are mixed up with each other, and with old events, by some feeling common to both; the second class relates to trains of images brought up by association with bodily sensations; the third, the result of forgotten associations; and the fourth class of dreams contains those in which a strong propensity of character, or a strong mental emotion, is imbodied in a dream, and by some natural coincidence is fulfilled. The following interesting cases that fell under Dr. Abercrombie's immediate notice, illustrate his views and the above classification.
Regarding the first class, Dr. A. relates the following: "A woman, who was a patient in the clinical ward of the infirmary of Edinburgh, under the care of Dr. Duncan, talked a great deal in her sleep, and made numerous and very distinct allusions to the cases of other sick persons. These allusions did not apply to any patients who were in the ward at the time; but, after some observation, they were found to refer correctly to the cases of individuals who were there when this woman was a patient in the ward two years before."
The following is an instance of phantasms being produced by our associations with bodily sensations, and tends to show how alive our faculties continue during sleep to the slightest impressions:
The subject of this observation was an officer in the expedition to Louisburg in 1758, who had this peculiarity in so remarkable a degree, that his companions in the transport were in the constant habit of amusing themselves at his expense. They could produce in him any kind of dream by whispering in his ear, especially if this was done by a friend with whose voice he had become familiar. One time they conducted him through the whole progress of a quarrel, which ended in a duel; and when the parties were supposed to have met, a pistol was put into his hand, which he fired, and was awakened by the report. On another occasion they found him asleep on the top of a locker in the cabin, when they made him believe he had fallen overboard, and exhorted him to save himself by swimming. They then told him that a shark was pursuing him, and entreated him to dive for his life. He instantly did so, and with so much force as to throw himself from the locker upon the cabin floor, by which he was much bruised, and awakened of course. After the landing of the army at Louisburg, his friends found him one day asleep in his tent, and evidently much annoyed by the cannonading. They then made him believe that he was engaged, when he expressed great fear, and showed an evident disposition to run away. Against this they remonstrated, but at the same time increased his fears by imitating the groans of the wounded and the dying; and when he asked, as he often did, who was hit, they named his particular friends. At last they told him that the man next himself in his company had fallen, when he instantly sprung from his bed, rushed out of the tent, and was only roused from his danger and his dream by falling over the tent-ropes. A remarkable thing in this case was, that after these experiments he had no distinct recollection of his dreams, but only a confused feeling of oppression or fatigue, and used to tell his friends that he was sure they had been playing some trick upon him. It has been observed that we seldom feel courageous or daring in our dreams, and generally avoid danger when menaced by a foe, or exposed to any probable peril.
The third class of dreams relates to the revival of forgotten associations. The person in question was at the time connected with one of the principal banks in Glasgow, and was at his place at the teller's table, where money is paid, when a person entered demanding payment of a sum of six pounds. There were several people waiting, who were in turn entitled to be attended to before him; but he was remarkably impatient and rather noisy, and being besides a remarkable stammerer, he became so annoying, that another gentleman requested him to pay the money and get rid of him. He did so accordingly, but with an expression of impatience at being obliged to attend to him before his turn, and thought no more of the transaction. At the end of the year, which was eight or nine months after, the books of the bank could not be made to balance, the deficiency being exactly six pounds. Several days and nights had been spent in endeavouring to discover the error, but without success, when he returned home much fatigued, and went to bed. He dreamt of being at his place in the bank, and the whole transaction of the stammerer, as now detailed, passed before him in all its particulars. He awoke under the full impression that the dream would lead him to the discovery of what he was so anxiously in search of, and on examination he soon discovered that he had neglected to enter the sum which he had thus paid.
The following singular dreams are examples of the fourth class. A clergyman had come to Edinburgh from a short distance in the country, and was sleeping at an inn, when he dreamt of seeing a fire, and one of his children in the midst of it. He awoke with the impression, and instantly left town on his return home. When he arrived in sight of his house, he found it on fire, and got there in time to assist in saving one of his children, who in the alarm and confusion had been left in a situation of danger.
A gentleman in Edinburgh was affected with aneurism of the popliteal artery, for which he was under the care of two eminent surgeons, and the day was fixed for the operation. About two days before the appointed time, the wife of the patient dreamt that a favourable change had taken place in the disease, in consequence of which the operation would not be required. On examining the tumour in the morning, the gentleman was astonished to find that the pulsation had entirely ceased, and, in short, this turned out to be a spontaneous cure,--a very rare occurrence in surgical practice.
The following dream is still more remarkable. A lady dreamt that an aged female relative had been murdered by a black servant, and the dream occurred more than once. She was then so impressed by it, that she went to the house of the lady, and prevailed upon a gentleman to watch in an adjoining room during the following night. About three o'clock in the morning, the gentleman, hearing footsteps on the stairs, left his place of concealment, and met the servant carrying up a quantity of coals. Being questioned as to where he was going, he replied, in a hurried and confused manner, that he was going to mend his mistress's fire, which at three o'clock in the morning in the middle of summer was evidently impossible; and, on further investigation, a strong knife was found concealed beneath the coals.
Dreams, to whatever causes they may be attributed, vary according to the nature of our sleep: if it is sound and natural, they will seldom prevail; if, on the contrary, it be broken and uneasy, by a spontaneous association dreams will become fanciful, and might indeed be called visions, so fantastic and chimerical are all the objects that present themselves in motley groups to the disturbed mind. This derangement in the sensorium may be referred to various physical causes,--the sensations of heat or of cold, obstruction in the course of the circulation of the blood, as when lying upon the back, a difficult digestion. In a sound sleep our dreams are seldom remembered except in a vague manner; whereas, in a broken sleep, as Formey has observed, the impression of the dream remains upon the mind, and constitutes what this philosopher called "_the lucidity of dreams_." It not unfrequently happens to us that we have had a similar dream several times, or at least we labour under this impression; nay, many persons fancy that particular events of their life at the moment of their occurrence had clearly taken place at a former period either in reality or in a dream. Morning "winged dreams" are more easily remembered in their circumstantial vagaries than those of the preceding night, for at that period (the morning) our sleep is not sound, and dreams become more lucid. These _revasseries_, as the French call them, are admirably described by Dryden:
A dream o'ertook me at my waking hour This morn, and dreams they say are then divine, When all the balmy vapours are exhal'd, And some o'erpow'ring god continues sleep.
That we are more or less impressionable in our sleep is rendered evident by the facility with which even a sound sleeper is disturbed by the slightest noise: the sparkling of a fire, or the crackling produced by the wick of our night-lamp when coming into contact with the water in the glass, the sting of an insect, the slightest admission of a higher or lower temperature, will occasion a broken sleep and its dreams. It has been remarked that the sense of seeing is more frequently acted upon in dreams than that of hearing, and very seldom do we find our smell and taste under their influence. It is possible that this peculiarity may arise from the greater variety of impressions with which the sight is daily struck, and which memory communicates by association or retransmission. Next to feeling, vision is the first sense brought into relation with external objects. When we hear noises, explosions, tumultuous cries, it is more than probable that our dreams partake of a delirious and morbid nature, or of sensorial or intellectual hallucinations, in which the mind is actually diseased, and our perceptions become erroneous: then we speak loudly to others, and to ourselves. When these hallucinations prevail after sleep, the invasion of mania may be apprehended.
Cabanis, in his curious investigations on the mind, has endeavoured to fix the order in which the different parts of our organization go to sleep. First the legs and arms, then the muscles that support the head and back: the first sense that slumbers, according to his notions, is that of sight; then follow in regular succession the senses of taste, smell, hearing, and feeling. The viscera fall asleep one after the other, but with different decrees of soundness. If this doctrine be correct, we may easily conceive the wild and strange inconsistencies of our dreams, during which the waking and the sleeping organs are acting and reacting upon each other.
Corporeal sensations and different organic actions frequently attend our dreams; but these may be attributed to our mode of living, or the indulgence in certain unruly desires and conversations. That man and animals dream of the pursuits of the preceding day there can be no doubt: hence the line,
Et canis in somnis leporis vestigia latrat.
The effects of a heavy meal, more especially a supper, in disturbing our rest, was well known and recorded by ancient physicians: and Crato tells us "that the fittest time to repair to rest is two or three hours after supper, when the meat is then settled in the bottom of the stomach: and 'tis good to lie on the right side first, because at that side the liver doth rest under the stomach, not molesting any way, but heating him as a fire doth a kettle that is put to it. After the first sleep 'tis not amiss to lie upon the left side, that the meat may the better descend; and sometimes again on the belly, but never on the back."
Our ancestors had recourse to various devices to procure sound sleep. Borde recommends a good draught of strong drink before going to bed; Burton, a nutmeg and ale, with a good potation of muscadine with a toast; while Aetius recommends a sup of vinegar, which, according to Piso, "_attenuat melancholiam et ad conciliandum somnum juvat_." Oppression from repletion will occasion fearful dreams and the night-mare; and bodily sufferings, when exhaustion has brought on sleep, will also be attended with alarming and painful visions.
Levinus Lemnius recommended to sleep with the mouth shut, to promote a regular digestion by the exclusion of too much external air. The night-mare is admirably described in Dryden's translation of Virgil:
And as, when heavy sleep has closed the sight, The sickly fancy labours in the night, We seem to run, and, destitute of force, Our sinking limbs forsake us in the course: In vain we heave for breath; in vain we cry; The nerves, unbraced, their usual strength deny, And on the tongue the falt'ring accents die.
In the Runic theology it was regarded as a spectre of the night, which seized men in their sleep, and suddenly deprived them of speech and of motion. It was vulgarly called witch-riding, and considered as arising from the weight of fuliginous spirits incumbent on the breast.
_Somnus ut sit levis, sit tibi coena brevis_, is the ancient axiom of our distich,
That your sleep may be light, Let your supper be slight.
Notwithstanding this rule of health, it is nevertheless true that many persons sleep more soundly after a hearty supper; and, most unquestionably, dreams are more frequent towards morning than in the beginning of the night. In my opinion, I should apprehend that the sound sleep of supper-eaters is to be attributed to the narcotic nature of their potations, more than the meal, although the _siesta_ of southern countries might be advanced in favour of a contrary opinion.
When philosophers speak of dreams being mental operations independent of the will, they speak vaguely, for the operations of the mind when we are awake are too frequently uncontrolled by volition. Did we possess this power over our rebellious thoughts, who would constantly ponder on a painful subject? Our thoughts cannot be suspended at will, and their influence has been beautifully described by Shakspeare:
My brain I'll prove the female to my soul, My soul the father; and these two beget A generation of still breeding thoughts.
Volition has no more power over thought when we are awake than sleeping; and, despite all metaphysical and psychological speculations, it cannot be demonstrated that the mind does not retain its full energies during sleep, only they cease to be regulated by judgment, and are not, to use Locke's words, under the rule and conduct of the understanding; and even on this opinion it has been fairly observed, that much of incongruity which is supposed to prove suspension of reason, and much of the wild discordancy of representation which appears to prevail during our sleep, may arise from the defect of memory when we are awake, that does not retain the impression of images which have passed across the mind in light and rapid succession, and which, therefore, exhibit but a partial and imperfect sketch of the picture that engaged the attention in sleep. The well-known fact that the impressions of our dreams are oftentimes more vivid and correct, when some time has elapsed, than on our awakening, tends to confirm this hypothesis; and these recollections are the more vivid when they bear any analogy to circumstances that come to pass.
Sir Thomas Brown was of opinion that sleep was the waking of the soul; the ligation of sense, but the liberty of reason; and that our waking conceptions do not match the fancies of our sleep. He thus expresses himself in his Religio Medici: "At my nativity my ascendant was the watery sign of Scorpius; I was born in the planetary hour of Saturn, and I think I have a piece of that leaden planet in me. I am no way facetious, nor disposed for the mirth and galliardise of company; yet in one dream I can compose a whole comedy, behold the action, apprehend the jests, and laugh myself awake at the conceits thereof. Were my memory as faithful as my reason is then fruitful, I would never study but in my dreams, and this time also would I choose for my devotions; but our grosser memories have then so little hold of our abstracted understandings, that they forget the story, and can only relate to our awaked souls a confused and broken tale of that that hath passed."