REM sleep

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REM sleep

A period of sleep during which dreaming takes place, characterized by rapid periodic twitching movements of the eye muscles and other physiological changes, such as accelerated respiration and heart rate, increased brain activity, and muscle relaxation. REM sleep is the fifth and last stage of sleep that occurs in the sleep cycle, preceded by four stages of non-REM sleep. Also called paradoxical sleep.

[r(apid) e(ye) m(ovement).]

REM′ sleep`

rapid eye movement sleep: a recurrent sleep pattern during which dreaming occurs while the eyes rapidly shift under closed lids. Compare slow-wave sleep.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.REM sleep - a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep
sleep, slumber - a natural and periodic state of rest during which consciousness of the world is suspended; "he didn't get enough sleep last night"; "calm as a child in dreamless slumber"
References in periodicals archive ?
REM sleep (also known as "paradoxical sleep") is characterized by irregular, low-voltage fast brain waves.
Researchers wonder if the need for REM sleep, with its buzzing brain activity, has something to do with that.
Depriving the brain of REM sleep by shortening the nightly sleep period from eight to six hours may significantly affect learning and retention.
We have around an hour and a half of REM sleep each night, but we forget most of what we dream about.
Scientists think that almost all mammals and birds have dreams because they have periods of brain electrical activity that match REM sleep in humans.
Results: There were no significant differences in the groups for total sleep time, sleep efficiency, sleep latency, rapid eye movement (REM) latency, percentage of stage 1 non-REM sleep and REM sleep.
These stages progress in a cycle from stage one to REM sleep, then the cycle starts over again with stage one.
Most dreaming occurs during REM sleep, when a person's eyes flick back and forth rapidly.
During REM sleep, your eyes move back and forth very fast behind your eyelids.
In addition to the numerous scientific investigations of each concept separately, sleep, memory, and learning have been studied together to determine (a) the effect of sleep on memory and learning, (b) the effect of sleep deprivation in general on memory and learning, (c) the effect of rapid eye movement (REM) sleep deprivation on memory and learning, (d) the effect of memory and learning on REM sleep, and (e) the effect of non-REM sleep loss on memory and learning.
Extensive studies have identified two different sleep states: REM sleep and nonrapid eye movement (NREM) sleep.
Problems arise if you take it for a long time, as the body needs to dream and you will catch up on REM sleep at the earliest opportunity.