Since the beginning of time, men are puzzled why they wake up with enormous, throbbing erections. Some men even suffered embarrassment with this involuntary thing. Now science might have the answer to that.

According to Sergio Diez Alvarez of the University of Newcastle men probably have as many as 5 erections per night – lasting up to 30 minutes each.
Photo: BuzzFeed

He also said that the reason men wake up with an erection may be related to the fact they often wake up coming out of REM sleep.

Alvarez said:

During REM sleep, there is a shift in the dominant system that’s activated. We move from sympathetic stimulation to parasympathetic stimulation. This is not found during other parts of the sleep cycle. This shift in balance drives the parasympathetic nerve response that results in the erection.

However, our bladders can also contribute to the said male phenomenon.
Photo: Scoopwhoop

It’s more likely the reason for the morning erection is that the unconscious sensation of the full bladder stimulates nerves that go to the spine and these respond directly by generating an erection. This may explain why the erection goes away after emptying one’s bladder.

So the next time you wake up with a huge hard bulge in your pants, it because of the shift in balance from sympathetic stimulation to parasympathetic stimulation or the urge to pee upon waking. Not unless you really had pornographic dreams. Lol!

Source: Metro