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It's not uncommon to roll out of bed and realize that, yep, you've got a full-blown erection. While that's a good thing for your sexual health, it's not always the best thing when you're running late and just need to throw on some slacks so you can get your ass to work.
And because it seemingly happens every single morning, we're sure you've wondered: "Why's this always happen?"
As it goes, we have as many as five erections through the night, which isn't that much of a surprise if you think about what you've dreamed about.
"The reason men wake up with an erection may be related to the fact we often wake up coming out of REM sleep," Sergio Diez Alvarez, of the University of Newcastle, said, writing for The Conversation. "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."
The actual name for morning glory is nocturnal penile tumescence (NPT). It isn't as catchy, but basically it means 'sleepy throbber'. It all starts in utero (in the womb), according to Men's Health, which technically means we've all had a hard on inside our mothers.
Women also have a similar experience during sleep, as they get clitoral erections and vaginal engorgement (distention of a body part or organ with blood or other fluids) during sleep.
"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," Alvarez says. "This may explain why the erection goes away after emptying one's bladder."
Every man seems to have his own way to actually get the thing down so he can "officially" start his day, but for those who wake up with a boner, be happy, because that means you're fighting a condition that, eventually, could lead to erectile dysfunction, so your penis is healthy.