REM sleep

/ˈɑr ˈi ˌɛm slip/
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Definitions of REM sleep
  1. noun
    a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
    synonyms: REM, paradoxical sleep, rapid eye movement, rapid eye movement sleep
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    type of:
    sleep, slumber
    a natural and periodic state of rest during which consciousness of the world is suspended
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