This is interesting to read. This has happen to me twice & I've never talked about it. Both when I was teenager. Both were the same, I was laying in bed on my stomach getting ready to fall asleep. Then it felt like something jumped into my back. My reaction was to get up and run the f**k out of the room but I couldn't move. I could heard someone talking into my ears but I couldn't understand what was being said. The tone was hostile. I kept trying to move my arms and legs and finally they moved and I hit the wall with my arm hard. I was sweating & scared. It took me quite sometime to finally fall asleep.