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- Dictionaryrapid eye movement
noun
- 1. a jerky motion of a person's eyes occurring in REM sleep.
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noun
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Unique phase of sleep in mammals and birds, characterized by random/rapid movement of the eyes
Rapid eye movement sleep is a unique phase of sleep in mammals and birds, characterized by random rapid movement of the eyes, accompanied by low muscle tone throughout the body, and the propensity of the sleeper to dream vividly. Wikipedia