A member asked:

Why do i have a erection when i wake up is this normal?

A doctor has provided 1 answer

REM sleep: Men have dreams during rem sleep (generally ~ 4 cycles per night) and will have erections due to increase blood flow, during rem sleep regardless of age. For a 21yr, the rem sleep is longer & frequently younger men will wake up with an erection.

Answered 5/15/2013

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