Why do guys get a hard-on in the morning?
My wife has asked this question and I didnt have a good answer. So, I happen to find one.
A reader recently asked why men get morning wood. Healthbolt has the answer:
Erections are controlled by the autonomic nervous system. Translation: when a guy is relaxed, erections are most likely. Since you’re often most relaxed upon rising (from sleep), morning wood makes sense. There are a couple of other factors that contribute to morning erections, as well. The bladder fills during the night, and this places pressure on a spinal reflex that can trigger an erection. Certain stages of the sleep cycle also influence the body’s involuntary behavior (ding ding ding). And of course, accidental touch or exposure to particular stimuli can do the trick.
Also, you can listen to these two guys discuss the matter. They do have medical degrees, but they’re not about to let those pesky things get in the way.
Source: Dr. Drew (duh)