REMARKS ON PHYSIOLOGY OF SLEEP
Czerny1 in his investigations of the sleep of children examined its depth and intensity under physiologic conditions; he used, as stimulus, the opening induction current, with increasing intensity, until awakening occurred. He demonstrated that the depth of sleep in healthy children depends on the period of sleep.In very young nurslings after satiation sleep reaches its greatest intensity within the first hour, whereupon a very slow decrease ensues; after an average duration of sleep of three hours awakening takes place for the purpose of feeding. In older infants this sleep lasts somewhat longer. In two infants, 9 months old, the curve of the intensity of sleep (Fig. 1) during the whole night, demonstrates in Czerny's experiments two parts, separated from each other by a short waking interval, the maximum of depth of the second period being much less than that of the first period.
STRAUCH A. SLEEP IN CHILDREN AND ITS DISTURBANCES. Am J Dis Child. 1919;17(2):118–139. doi:10.1001/archpedi.1919.04110260035004
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