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Eye movements during sleep in weightlessness

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Science  13 Jul 1984:
Vol. 225, Issue 4658, pp. 221-222
DOI: 10.1126/science.6729480


The number of eye movements during sleep increased during the first sleep period in zero gravity but returned to normal by the second night. These rapid-eye-movement functions in flight may be the first variations of an oscillatory system. The ratio of the higher and lower eye movement frequencies oscillates within normal-gravity limits.