Where in the sleep cycle do erections happen?

Nighttime erections occur in the REM (rapid eye movement) phase of sleep, and REM sleep is more frequent just before waking up. During sleep, there’s increased blood flow to the area, and that’s what contributes to the frequency of nighttime erections. In fact, you’ll probably get erections every two or three hours at night, which is actually a form of exercise for your penis.

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