Through my whole childhood and before i started masturbation, I can think of only one or two times I had sleep paralysis.
when I started the habit of masturbation, I used to get sleep paralysis on the same day I had an orgasm. It was very terrifying in the beginning that I thought I was going to die everytime I get it. over time, I developed ability to recognize sleep paralysis when I'm having an episode. which makes it a little bit horrible, knowing it is a temporary thing and i'm going to survive.
I don't have that now as much as I used to do. My POIS is worse than before tho. May be sleep paralysis is a phenomenon that goes along with a sort of body healing from POIS.
Speaking of sleep problems, POIS makes my sleep experience worse. for example, When I'm about to fall deeply asleep, I wake up stressed out, as if my body is refusing to sleep. I get Nightmares more than a normal person do. I haven't had a deep sleep for ages (even when I stop having Orgasms).