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Insomnia
Recurring problems in falling or staying asleep.
Narcolepsy
A sleep disorder characterized by uncontrollable sleep attacks. The affected person may lapse directly into REM sleep, often at inopportune times.
Sleep apnea
A sleep disorder characterized by temporary cessation of breathing during sleep and repeated momentary awakenings.
REM sleep behavior disorder
A sleep disorder in which normal REM paralysis does not occur, instead twitching, talking or even kicking or punching may occur, often acting out one’s dream.
Dream
A sequence of images, emotions, and thoughts passing through a sleeping person's mind.
REM rebound
The tendency for REM sleep to increase following REM sleep deprivation