Quadens O, Green H
Science. 1984 Jul 13;225(4658):221-2. 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.
在零重力环境下，睡眠期间的眼球运动次数在第一个睡眠阶段有所增加，但到第二晚就恢复了正常。飞行中这些快速眼球运动功能可能是振荡系统的最初变化。高低眼球运动频率之比在正常重力范围内振荡。
