I have actually had a few episodes of sleep paralysis. I can remember one time last year sometime I was laying there sleeping and then I felt myself wake up and I saw a figure in the doorway of my bedroom. It was hunched down on all fours. It seemed almost human but with a bluish skin. It was moving... almost twitching back and forth. I tried to wake my husband but could get my body to move or words out of my mouth. It was creepy.