A bedroom into whose windows flashes of light or waves of sound may pour, is the not ideal place in which to seek escape from reality. Yet thousands of people sleep soundly in Pullman berths or even in day coaches, unmindful of the noise, light and bustle. We must keep in mind an observation made by Bleuler at the Zürich clinic: "When many people sleep in the same room, as in an insane asylum, some complain that they cannot sleep because their neighbour is snoring. Whoever tries to prevent the snoring or to move the snorer to another bed will have an endless task. The trouble is with the patient who is disturbed by snoring. It is not the noise itself but the attention he pays to it which disturbs him. One can see in wards for agitated patients most of the patients sleeping peacefully while some one disturbs the ward with the most savage howling. "The trouble lies, not in a special sensitiveness of the nervous system, but in the attitude we take toward a certain noise." Lack of exercise during the day will often cause us to toss and turn many times in our bed after retiring. There seems to be in every living being a craving for activity without any positive aim, activity which accomplishes nothing besides using up unused energy or relieving certain inhibitions. Children and all young animals seem to be unable to remain motionless for any length of time. In children and puppies, for example, the gleeful shouts and barking which accompany that display of muscular activity show unmistakably that it vouchsafes them a great amount of gratification. The satisfaction of the free activity urge which is one of the aspects of the ego-power urge is probably submitted to a strong repression in men and animals at a rather early age by the safety urge; frightened children and animals stop playing and become at times paralysed by fear. On the other hand there are many sluggish individuals who lead an most inactive life and yet sleep long hours without any interruption. Indigestion causes insomnia and so does hunger but it is also a fact that many indiscreet eaters are made drowsy by their very indiscretion and sleep soundly after a meal which would distress many other people. Also we find in the sayings of many races statements to the effect that sleep assuages hunger; the average prisoner sleeps in spite of the insufficient meal served at night in the majority of jails. Constipation seems at times to bear the guilt for restless nights and so do cathartics which, with some subjects, produce intestinal tension several times during the night but whose effect is not noticeable in other subjects until they wake up in the morning at the regular time. Toothache will keep some people awake while others will go to sleep in order to forget their toothache. Examples of that sort could be cited ad infinitum.