REM sleep

rem-sleep的词性：
n.（名词）

1. A stage in the normal sleep cycle during which dreams occur and the body undergoes marked changes including rapid eye movement, loss of reflexes, and increased pulse rate and brain activity.Also called paradoxical sleep
快速眼动睡眠：正常睡眠循环中的一个阶段在这期间做梦并且身体产生明显的变动，包括快速的眼睛的运动；身体失去反射动作，脉搏加快，大脑活动加速也作 paradoxical sleep