A morning erection that is naturally caused as the brains enters the REM-deep sleep phase. At this stage, the body's skeletal muscle structure relaxes and causes hypervasodilation in the capillaries of the body, resulting in said erection.
After sleeping so soundly and having a great night's rest, it is no surprise to wake up with an erection.

Waking up with a HardOn is also known as a Morning Lift-Off

Morning Lift-Off by HeadCandy February 20, 2009

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fart lift off

(Spanish) When you fart so hard you literally take off from your seat

My head really hurts. It started yesterday when I smashed my head against the ceiling after a fart lift off

fart lift off by Jose the crack smuggler April 27, 2004

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lunar lift-off

Two people stand butt to butt and fart simultaneously. Performing this on the moon while naked can result in forces capable of granting the human body an escape velocity from the lunar surface.

My coworker and I had a lunar lift-off that could rival the Apollo missions.

lunar lift-off by Hope Fully August 18, 2022

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