Sleeping in the Light.—The habit of accustoming children to sleep with a light in the room nearly always lessens the depth of their sleep. They are more easily wakened and their sleep is not so refreshing. Besides, if they do not grow accustomed to the dark when they are young, they may always retain a dread of the dark and will require some light in the room where they sleep. Nature intended that the eyes and the optic nerve should have as complete a rest as possible and even with the lids lowered some light stimulus, if it is present, finds its way to the nerve fibers. Hence the desirability of having as far as possible an absolutely dark room. For some very timorous children, this may seem impossible. Many mothers will recall how awful the dark seemed to them and what shadowy shapes loomed up in it. It will usually be found on inquiry, however, that in these cases the children, after having been accustomed to sleep with some light and after having had all sorts of exciting pictures shown them and stories told them, were asked to sleep in the dark. From the very beginning they should be accustomed to sleeping in the dark and then it has none of the terrors thus pictured.
CHAPTER IX
DREAMS
Dreams, that is, thoughts and illusions and mental phenomena of various kinds that occur during sleep, have always been interesting to the psychologist, and have usually been related to physicians by patients either because they were thought to have a significance related to disease, or because something in them disturbed the patient's mind. This is almost as true in the modern time as it was long ago. It is curiously interesting to note that the very latest development of psychotherapy includes the use of hints obtained from dreams in order to determine the origin of psycho-neurotic conditions and certain of the minor psychic disturbances, and also as a foundation for treatment. The oldest stories of therapeutics that we have are those of patients waited on by the priest physicians of the olden times in the temples, who were supposed to be greatly helped by information obtained from the patient's dreams. It is interesting to read such recent studies as that of "Incubation in the Old Temples," by Miss Ingersoll, with the thought in mind that we are once more analyzing dreams in order to accomplish a similar purpose.
Dreams are so often a source of disturbance of mind for patients, lead to such disturbed sleep, or even so affect the bodily health that it is important for anyone who wants to influence patients through their minds to know the significance attributed to dreams by the most recent studies of them. This is all the more important because dreams are such a universal phenomenon. From our earliest years we dream. The night terrors of children are probably due to dreams and show that even as early as the age of three we dream vividly. Doubtless some of the terrifying dreams of childhood are similar to those that we experience later. Dreams of falling, dreams of being cold, of being out of breath, with vivid repetitions of exciting scenes through which they have gone during the day, or which they have seen in picture or been told in story, form the substance of these dreams. Children are likely to be much disturbed by them. They wake in a terror of anxiety, in cold sweat, and crying bitterly because of their dream visions. Older people are not so much disturbed at the moment, but often brood over dreams and may be seriously affected by them.
It is difficult, however, to persuade many people that their dreams have no special significance, either of present or of future evil, and to many the fact that they dream much becomes a suggestion of wakefulness that disturbs sleep and makes them quite unequal to the next day's work, because they have the feeling that, as they have been dreaming all night, they must be quite tired. Tiredness in nervous people is often a matter of the mental state rather than of physical exhaustion or genuine mental weariness. The actual place of dreams in psychology, then, becomes an important consideration in psychotherapeutics.
Our real advances in the knowledge of the significance of dreams have come from the study of the dreams that are common to most people. These show us exactly how and why dreams occur and just what their meaning is. Probably the most familiar dream common to all the human race is that of falling from a height. Everyone has been wakened with a startled sense of intense relief that the sensation of falling was illusory. The waking came just before the bottom was reached. There is a tradition that if one ever did strike the bottom in one's dream it would be the end and that death would result as surely as if the fall were real. So far we have had no one come back to tell us of that, and the tradition is reasonably safe from direct contradiction. It serves without any reason, however, to disturb timorous people and make them dread to fall asleep again. Often this dream-falling so seriously affects sensitive individuals that they do not get to sleep for an hour or more and occasionally those with an inclination to insomnia may even suffer for the rest of the night from the effect of it. It is important to explain, then, what we know about the causation of the dream. In nearly all cases the subject on waking finds himself on his back, and then the inclination is at once to turn over to the side with a sigh of relief. Commonly the dream occurs rather early in the night, when a rather heavy meal has been taken shortly before retiring. The weight in the stomach, particularly if considerable liquid has been taken, seems to press upon the abdominal aorta and interferes, to some extent at least, with the circulation to the legs. This deprives little nerves at the periphery of the body of some of their nutrition and causes a tingling feeling in them. This is quite different from pressure [{671}] on nerves, which gives the sensation termed "being asleep" to a limb. This tingling feeling resembles that which we experience when going down rapidly in an elevator. It is the falling sensation. This sensation tries to force its way into the consciousness and in this process does not completely wake consciousness up, but brings about an association of ideas connected with falling—hence the dream of being on a height and of falling therefrom out of which we wake so startled. The whole process instead of being injurious is really conservative. It is important that the aorta should not be pressed upon and this is the mode by which awakening is brought about and the position shifted so that further interference is stopped, though we ourselves are quite unconscious of the real purpose that has been accomplished. An explanation of this kind usually makes people who suffer from such dreams and have been disturbed by them much more tolerant of the phenomenon and more ready to go to sleep again, since evidently nature can be trusted to care for them even during sleep.
After the sensation of falling probably the commonest dream that humanity has, at least in the civilized state, is that of being out in some public place without sufficient clothing. Usually we wake just to find that some portion of our anatomy has been exposed to the air and that it is cold. It is this sensation gradually forcing its way into consciousness that has gathered around it a group of ideas that form our dream.
Among men, a familiar dream is that of running for a car, or away from something, or to catch someone, and finding that it is almost impossible to move. We are so out of breath that we are scarcely able to drag one foot after another and, indeed, sometimes we seem to be actually rooted to the spot. We cannot move at all. When we wake after this dream we find that, because of a cold in the head, our nose is stopped up by the secretion and that our mouths are shut and consequently we were getting no air. When that sensation tries to break into the consciousness there gather around it certain familiar ideas usually associated with being out of breath and hence we have the dream of trying to run without being able to move.
Frequency of Dreams.—Nervous people often complain that they dream all night or else very frequently, and that as a consequence their sleep is not restful. It is probable that there are always ideas in the mind and that literally we dream without ceasing. These ideas, however, do not get into our consciousness except just during the process of waking. All those who have investigated the subject of dreams are practically agreed on this. In subsequent paragraphs we quote a number of good observers on this subject. Certainly this is what we should expect from what we all know about day-dreaming. We can never catch ourselves during the day without finding some thought wandering through our minds. If we want to understand dreaming during sleep this day dreaming is instructive. We jump from one idea to another, apparently without a connection; yet there is always some connecting link. We have just read in the paper of someone in Cairo, and we think of old Egypt, and then of old Babylonia, and the Code of Hammurrabi, and the laws of the Medes and the Persians, and Xenophon and our school days, and of an old schoolmaster now a missionary in Japan, and of Japanese art and of an American artist much influenced by it, and of one of his great windows in a church in New York and of social work in connection with that church, [{672}] and of settlement houses and then Hull House, Chicago, and then of the Adamses in Massachusetts, and so on.