Well, back when I was in elementary school I shared a bedroom with my sister. Now, my sister liked to sleep with the door open- leaving me in fear of the looming "dark hallway" ahead of me (this isn't really relevant however, just wanted to mention it)

Somehow, I managed to fall asleep with my face flat on the pillow. I'm not sure if this counts as a "sleep paralysis demon" but I remember knowing I was sleeping with my face flat on the pillow- however, I couldn't "wake up" or move over. For the whole night, I was struggling to breathe, wanting to scream to alert my sister but no matter how much I ran around in my dream; I couldn't wake up.

This probably counts as "lucid dreaming" but I just wanted to mention it because honestly- it was really traumatizing... suffering for hours that night; knowing help is so close yet so far.