REM sleep

From Fresh Dictionary

English

Noun phrase

REM sleep or R.E.M. sleep ((uncountable{{#if:|, {{{2}}}{{#if:|, {{{3}}}{{#if:|, {{{4}}}{{#if:|, {{{5}}}{{#if:|, {{{6}}}{{#if:|, {{{7}}}{{#if:|, {{{8}}}{{#if:|, {{{9}}}}}}}}}}}}}}}}}}}))

1. The part of sleep during which a person dreams, characterised by rapid eye movement (REM).