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REM sleep: Meaning and Definition of

REM' sleep"

Pronunciation: [key]
? Physiol. Physiol.
  1. a recurrent period of sleep, typically totaling about two hours a night, during which most dreaming occurs as the eyes move under closed lids and the skeletal muscles are deeply relaxed. Also calledCf.
Random House Unabridged Dictionary, Copyright 1997, by Random House, Inc., on Infoplease.