REM sleep


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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.

REM sleep

n.
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.

REM sleep

Rapid eye movement sleep, desynchronized sleep, paradoxical sleep Neurology A 5 to 20 min segment of a normal sleep cycle, characterized by irregular heart rate and respiration, BP, EEG similar to awake and alert state, involuntary or jerky muscle movement, and higher threshold for arousal; the usual high-amplitude slow brain waves seen by EEG are replaced by rapid eye movement and rapid, low-voltage irregular EEG activity. See Insomnia, Sleep disorders.

REM sleep

Rapid eye movement sleep. This occurs during about 20% of the sleeping time and features constant movement of the eyeballs, twitching of the muscles and erection of the penis in men. REM sleep is deep and is associated with dreaming. It is necessary for health.

REM sleep

Rapid Eye Movement phase of sleep, a mentally active period during which dreaming occurs.
Mentioned in: Night Terrors
References in periodicals archive ?
If our REM sleep is disrupted one night, our bodies don't follow the normal sleep cycle progression the next time we doze off.
Sleep talking does not usually occur in REM sleep, so sleep talkers are probably not talking about their dreams.
Grosvenor and Lack conducted a study that controlled for the possible effect of non-REM sleep on REM sleep post-learning.
Thus, most studies have reported a dose-dependent suppression of REM sleep at least during the first half of the sleep period (Williams and Salamy 1972).
Patients who remained disease-free at follow-up showed markers of increased short-term risk for developing PD," including lesions "in the brainstem nuclei that regulate REM sleep atonia," the Spanish researchers found.
Likewise, if stage REM sleep occurs early in the test, the test continues for the full 15 minutes following sleep onset.
One particular physiological event, which is a hallmark sign of REM sleep, is the appearance of phasic pontine waves (P-waves).
Local administration of agonists in the dorsal raphe nucleus mainly produces a response similar to low-dose systemic administration, decreasing wakefulness and increasing REM sleep via disinhibition of mesopontine REM sleep-promoting neurons (Bjorvatn and Ursin, 1998).
REM sleep behavior disorder (RBD) "is a striking parasomnia very common in Parkinson's disease," Dr.
These different states may overlap or intrude into one another, and it is the overlap of wakefulness and NREM sleep that gives rise to confusional arousals, and the intrusion of REM sleep into waking that produces REM sleep behaviour disorder (RBD).