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Nocturnal Penile Tumescence

Nocturnal Penile TumescenceMen have several erections while they sleep at night.

The clinical name for these erections is nocturnal penile tumescence (NPT). They happen to males of all ages, even babies, but they have nothing to do with sexual stimulation.

So why do they happen? Scientists aren’t completely sure, but NPT seems to be affected by sleep cycles.

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Who knew? There's a science of "morning wood." Click here to tweet.

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Humans go back and forth between deep sleep and rapid eye movement (REM) sleep several times during the night. REM sleep is lighter sleep and is the cycle when dreams occur.

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