Sleep.

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Abstract
In this review the authors offer a searching analysis of (1) attempts to determine the depth of sleep by one type of sensory stimulation (papers by Kohlschutter, Monninghof and Piesbergen, Michelson, Czerny, de Sanctis Neyroz) ; (2) studies of rest and activity based on registration of changes in bodily position (papers by Szymansky, Karger, Kreidl and Herz, Guttmann, Van Leeuwen) ; (3) measurements of O consumption upon awakening from sleep of variable duration (paper by Laird and Wheeler) ; (4) histological changes in the nervous system resulting from prolonged wakefulness (papers by Bast et al.) ; and (5) miscellaneous papers not falling into the above classifications. These criticisms should be of interest to all students of the physiology of sleep.

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