I think I had a sleep paralysis during a nap one time, and it was pretty tense. Could hardly breathe, and I thought I saw a shadowy figure sitting on a nearby bed with a lantern on its lap. Once I snapped out of it, I could see that my mind had just been exaggerating a shadow coming from outside a window opposite to the bed, with a glint of light in the middle of the dark area being what had looked like a lantern. This is still a lot tamer compared to what I've heard others going through. I've read that the trick to getting out of sleep paralysis quick is wiggle your extremities, like toes. Helped me when I was feeling paralyzed another time.