You’ll notice them in the morning most because a) you’re awake and b) you’ve had several hours for your bladder to fill, probably enough that you need to relieve it. This puts physical pressure on the sacral nerve, causing the erection. In turn, the erection closes the sphincter to the bladder more tightly because getting urine in the vagina during sex would change the pH and possibly kill sperm you have deposited/will deposit, which makes not tightening that sphincter an evolutionarily disadvantageous trait. This does make it something of a self-reinforcing cycle, though.
I can not answer why, but I’ve been told I do it too.
And wake up holding my junk a lot of the time.
A lot of the times it’s definitely to reposition balls.
So sometimes not because it’s comfortable per se (and it is), but because doing it avoids possible discomfort, I guess.
Also, morning wood. What’s that about? What’s the benefit of getting an erection when we wake up? O.o
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Yeah this is an answer I’ve heard, but it’s sort of generalised.
I’d like a every detailed medical explanation on why it happens specifically when waking up.
It’s the wrong answer. Also, it’s not just when you wake up - it’s at various times during the night. The real answer is the sacral nerve: https://health.clevelandclinic.org/men-get-morning-erections-5-answers-questions
You’ll notice them in the morning most because a) you’re awake and b) you’ve had several hours for your bladder to fill, probably enough that you need to relieve it. This puts physical pressure on the sacral nerve, causing the erection. In turn, the erection closes the sphincter to the bladder more tightly because getting urine in the vagina during sex would change the pH and possibly kill sperm you have deposited/will deposit, which makes not tightening that sphincter an evolutionarily disadvantageous trait. This does make it something of a self-reinforcing cycle, though.
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