I had a pretty terrifying experience earlier today. I was taking a nap and was about to wake up from it, in that half awake/half asleep stage....where you can't move....
So I was laying there and could kind of partially open my eyes and see the room. No one else was in the room, but then my eyes closed (because I couldn't keep them open) and I heard footsteps in the room...someone walked in and got on the bed, and then the person straddled me and sat on me (like their knees were on either side of my hips). I could feel the weight of the person's body on me and I could not move. I was struggling to open my eyes or move but I couldn't.
Then the weight moved up to my chest. It was getting really hard to breath with the weight on my chest. I struggled to try to wake myself up, but I couldn't open my eyes. I knew it was a dream, but I wondered if you could die because you stopped breathing in your dream. So then I decided that I had to fight to wake up, so I tried with all my effort and finally I opened my eyes. No one was on top of me, of course, but I was very freaked out.