Morning wood is a slang term for nocturnal penile tumescence, which means waking up with an erection. It can happen in the middle of the night or the early morning hours while you’re sleeping. If you ...

The medical term for “morning wood” is nocturnal penile tumescence. It refers to a person having an erect penis when they wake up in the morning. Nocturnal penile tumescence (NPT) is not a result of ...