Yeah, in fact that is one of the main reasons I like sleep (the other reason is that sometimes in dreams I get to be a pirate or fight ninjas and shit).

It you're waking up after any amount of time feeling clamny, sick, or like you've just been drugged, I'm gonna say that's not normal and you should get it checked out by a medical professional.

You know what causes your glymphatic system to stop working? Sleep apnea!

You don't know that. Get looked at for sleep apnea, wear the thing for a few nights and report back with results

You have no reason to insist that all the observations you are lumping together are actually related by cause.