Rapid eye movement - Rapid eye movement

… REM sleep alternates with non-REM sleep at approximately 90-minute intervals. The brain waves during REM sleep are similar to those during S1, but it is distinguished from S1 by the presence of rapid eye movement (REM) similar to that observed during wakefulness. This characteristic is why it is called REM sleep, and because REM is not observed in other sleep stages, it is called non-REM sleep. …

*Some of the terminology that refers to "rapid eye movement" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…　レム睡眠REM sleepはノンレム睡眠と約90分間隔で交代する。レム睡眠の脳波はS1のときと似ているが，覚醒時と同じ急速眼球運動rapid eye movement(REM)がみられることでS1と区別される。この特徴のためにレム睡眠と呼ばれ，他の睡眠段階ではレムがみられないのでノンレム睡眠と呼ばれる。…

※「急速眼球運動」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報