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I think it's common, but not universal. I sleep on my side hugging a 2nd pillow. That's the most comfortable for me. When I wake up in a weird position, it's on my back with arms splayed out like a gunshot victim.
Finally someone else who sleeps hugging a pillow.
It has nothing to do with the lack of childhood affection.
I have a pillow both to the left of me and the right so I always have one to grab when I turn over.
Yeah, it's just secure and comfortable.
Balls aren't directly sexual, but holding onto them can be like rubbing your eyes, just kind of non-specifically pleasant.
Using your belt/waistband is a comfortable and good way of stopping your arms dangling and flopping around while you relax/sleep.
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
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.