REM rebound
Encyclopedia
REM rebound is the lengthening and increasing frequency and depth of REM sleep which occurs after periods of sleep deprivation
Sleep deprivation
Sleep deprivation is the condition of not having enough sleep; it can be either chronic or acute. A chronic sleep-restricted state can cause fatigue, daytime sleepiness, clumsiness and weight loss or weight gain. It adversely affects the brain and cognitive function. Few studies have compared the...

. When people are prevented from experiencing REM, they take less time than usual to attain the REM state.

Common to those who take certain sleeping aids
Sleeping pills
Sleeping pills may refer to:*Hypnotic, a drug used to induce sleep*Sleeping Pills , an American film by Michael Lauter...

, it is also often seen in the first few nights after patients with obstructive sleep apnea syndrome are placed on CPAP
CENPJ
Centromere protein J is a protein that in humans is encoded by the CENPJ gene. It is also known as centrosomal P4.1-associated protein .-Further reading:...

. Alcohol can also have an impact on REM sleep; it suppresses it during the first half of the night, leading to a rebound 4 to 5 hours after sleep onset.
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