Jisho

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Noun
1. REM sleep
Wikipedia definition
2. Rapid eye movement sleepRapid eye movement sleep (REM sleep) is a normal stage of sleep characterized by the rapid and random movement of the eyes. REM sleep is classified into two categories: tonic and phasic. It was identified and defined by Nathaniel Kleitman, Eugene Aserinsky, and Jon Birtwell in the early 1950s.
Read “Rapid eye movement sleep” on English Wikipedia
Read “レム睡眠” on Japanese Wikipedia
Read “Rapid eye movement sleep” on DBpedia
Other forms
REM睡眠 【レムすいみん】

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