STUDIES ON THE PHYSIOLOGY OF SLEEP

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Abstract
VII. Lying down, especially after standing up, led in 4 young men to a fall in temp., as recorded by a Leeds and Northrup electrical resistance thermometer, and this fall was sometimes accentuated by the onset of sleep. Standing after lying produces a rise in body temp. VIII. In a number of simple tests on 6 subjects there was a diurnal variation in performance (speed and accuracy), with a maximum in the afternoon and minima early in the morning and late at night. The curve of performance followed the body temp. curve, and was interpreted as a possible indication of a diurnal rhythm in the tonicity of the body musculature and as being responsible for the development and persistance of the diurnal sleep habit.

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