I was under the impression that morning wood was caused by your body waking up and starting to pump blood at a faster rate. The extra blood flow brings about an erection.
The other reason I heard was that it's just a natural occurence during REM sleep, and it just lasts til you wake up.
Though personally, i more often then not wake up without an erection, but when i go to stretch, that's when it starts poppin up. Makes sense with the whole increase blood flow activity I stated above.
The full bladder against the prostate thing doesn't make sense. Wouldn't we have an erection every time we had to pee but couldn't? Not saying you're wrong, just trying to get clarity.
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