"Morning wood" refers to nocturnal penile tumescence, which involves waking up in the morning with an erection. This is a normal o...

Medical News Today: What is 'morning wood,' and why does it happen?

"Morning wood" refers to nocturnal penile tumescence, which involves waking up in the morning with an erection. This is a normal occurrence. Changes in how often it happens can signal a health condition that may need treatment from a doctor. Learn more here.

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