Rapid eye movement

(Abbr. REM) The rapid periodic jerky movement of the eyes during certain stages of the sleep cycle when dreaming takes place.

The noun has one meaning:

Meaning #1: a recurring sleep state during which dreaming occurs; a state of Rapid Eye Movements during sleep
  Synonyms: paradoxical sleep, rapid eye movement sleep, REM sleep, REM

Rapid eye movement may refer to:

• Rapid eye movement sleep or REM sleep
• Saccade, a fast movement of an eye
• Rapid Eye Movement (album), an album by Riverside

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