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.
Well yeah, it's just during the night in general. Hell I'm not even awake in the mornings, lol.
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.
Says you. It sure as shit does for me, especially when I'm trying to hold it, and it's sometimes a bastard and a half to get myself "calmed" again so I can pee.
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.
That wasn't supposed to be offensive "bro". perhaps if you read it you'd see its not a "sign of autism" per se, but of neuro-atypicality. You could have read this and gone "wow, I DO sleep like that, maybe I should look into this" or "No not quite like that" but sure, you go to with the "Random internet stranger called me autistic" response.
In the rare occasion I wear something to bed, I've never done this. If I've done it in my sleep, I don't recall waking up that way or anyone ever commenting on it. My wife will sometimes sit with her hand in her pants on the sofa, kinda like Al Bundy.
I sleep weird, on my side, top leg extended forward parallel to my torso and bent at the knee, and bottom leg straight as to follow my torso. My foot of my top leg is often positioned touching the upper part of my bottom leg as to make a triangle.
In maintaining this position I find my manhood is free, in failing this I often cup.
Reason why: its uncomfortable to have my privates sticking to my legs, or squished between my legs
Also I sleep nude might help explain the weirdness.
My dogs jump on my balls when we get in bed at night. So I cover when laying down in bed. Habit of many years now I'm sure even when I don't have dogs I'll still do it for no rational reason
If you have a guy in your life that you are intimate with, try it out. Hang out on the couch cuddled up to him and give the boys a hand cuddle. You can also do him a favor and check for lumps while you are there.