An involuntary full or partial erection when sleeping or waking up.

• Often used when a character is in bed, yawning, stretching, or just generally groggy, morning wood is not due to arousal, at least most of the time, instead it is the body´s blood pressure rising hour prior, and lots of the time, an embarrassing side effect my occur.

See also:

• Flaccid
• Half-erect
• Erection
• Morning wood