Why do I wake up with an erection in the morning?

surprised and shocked good looking young man in bed looking down at his penis under white covers sheet in bedroom. Concept photo of male sexuality and man sex peny problems, domestic atmosphere.

Nighttime and early morning erections are a normal part of male penile health. The technical term for this is “nocturnal penile tumescence.” The exact cause isn’t understood, but nighttime and morning erections usually occur during a part of sleep called REM sleep. They’re thought to be important to maintaining healthy blood flow to and function of the penis.

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