I have it often. The other night I had an episode in which I was frozen and some black figure was choking and pressing down on me. I swear I heard it speak to me too. Can't remember what it said but I actually thought I was being possessed. Most terrifying experiences ever.
On a lighter note, I believe lucid dreaming and sleep paralysis are somehow linked, as I've had a couple of lucid dreams, which feel similar to sleep paralysis. Lucid dreams ( in my experience ) aren't like they are in the movies. It isn't like a sandbox game where you do what you want. I got dropped in several situations where I was conscious that I was dreaming and I could control my own actions, like I remember driving a car over a bridge.
Sleep paralysis and lucid dreams are for sure one hell of an experience.
#11 I've also had experiences with sleep apnea, which is equally as fucking terrifying. Not sure if it's related to paralysis.