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Show SOME FACTS ABOUT SLEEP Caused by a Withdrawal of Blood From the Brain, 8aye Modern Physiology. All the organs of life rest la some way or other. The heart has an Interval In-terval of rest between each combined art of contraction and expansion and the beginning of a fresh act. Between Be-tween each expiration of the lungs snd the succeeding Inspiration there is a period of repose. Physiologists have calculated that the heart reposes re-poses during about onefourth of the time. Certain of the other organs suspend their activity In part during sleep. Old phyilologlsta supposed that aleep was caused by the pressure of the blood on the brain. Hut modern physiology, with a tendency to regard the brain as the origin of all force and of all functions of the body, Inclines In-clines to the View that sleep is caused by a withdrawal of blood from the brain. As a rule, the larger the brain the more sleep It requires. Webster went to bed at nine o'clock and rose at five. General Grant used to say, during dur-ing his campaigns. "I can do nothing noth-ing without nine hours' sleep." A curious trait has marked men of large brain that of sleeping at will. Bonaparte used to throw himself on the ground and go to sleep within a space of two minutes. Pitt was sound sleeper, and slept night after night In the house of commons while his colleagues watched the debate and roused him when it was neces sary that be should speak. |