feel like someone is holding you dont bu? the other day when i was sleep, and i knew i was sleep, i was trying to wake up and i couldnt, i felt like someone was holding me down, i tried moving as hard as i could but i felt like someone was over me, it kinda scary.then i finally had the strength to open my eyes, i look and nobody was there. someone please tell me what this mean cause it happen more than once, and kinda creep me out cause someone told me it means i was possessed, but im not sure i believe in that, has this happen to anybody else but me, if so do you know why this is happening?