rapid eye movement sleep

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Related to REM Cycle: NREM sleep

rap·id eye move·ment sleep

, REM sleep
that state of deep sleep in which rapid eye movements, alert EEG pattern, and dreaming occur; several central and autonomic functions are distinctive during this state.

rapid eye movement sleep

See REM sleep, Sleep stages.

Rapid eye movement (REM) sleep

A phase of sleep during which the person's eyes move rapidly beneath the lids. It accounts for 20-25% of sleep time. Dreaming occurs during REM sleep.
Mentioned in: Sleep Disorders


a period of rest during which volition and consciousness are in partial or complete abeyance and the bodily functions partially suspended; a behavioral state marked by characteristic immobile posture and diminished but readily reversible sensitivity to external stimuli.

sleep deprivation
caused in animals by constant stimulation, e.g. preventing them from lying down, is followed by a compensatory period of prolonged sleep whenever the opportunity arises.
sleep disorders
put to sleep
a common euphemism for euthanasia.
rapid eye movement sleep
that type of sleep characterized by low voltage but fast electroencephalographic activity and little muscular activity except of the ocular muscles. Believed to be the critical or necessary component of sleep. Called also 'sleep of the body' and paradoxical sleep. Called also REM.
References in periodicals archive ?
With up to six REM cycles a night--about every 90 minutes--you can have hundreds of dreams
Biologically, said Walsleben, women actually sleep better than men -- they sleep deeper for longer and have longer REM cycles.
As a result of this relationship, those who are unable to fully sleep at night - whether it is caused by sleep apnea, insomnia or another abnormality - are unable to go through the appropriate number of REM cycles and are forced to live with a higher chance of chronic headaches.