Reports

Encephalic Cycles during Sleep and Wakefulness in Humans: A 24-Hour Pattern

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Science  25 Apr 1969:
Vol. 164, Issue 3878, pp. 447-449
DOI: 10.1126/science.164.3878.447

Abstract

Twenty-four-hour polygraphic tracings from normal humans indicate that a pattern of alternating periods of the presence and absence of rapid eye movement, shown to exist for normal sleep, exist over all 24 hours of the daily period. This finding suggests that the so-called sleep-dream cycle of human sleep is not specific to sleep, but is a general activity pattern of the brain.