WordReference Random House Unabridged Dictionary of American English © 2025
REM′ sleep′, [Physiol.]
  1. Physiologya 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 called paradoxical sleep. Cf. slow-wave sleep. 
  • 1965–70

'REM sleep' also found in these entries (note: many are not synonyms or translations):
NREM sleep - paradoxical sleep - rapid eye movement sleep - slow-wave sleep

Forum discussions with the word(s) "REM sleep" in the title:


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