You just described my recurring dream experiences from my early childhood (I'm 26 now). In each of those dreams I was in some dark room (often a familiar place like my or my grandmother's flat). I sensed a presence of an evil creature at the far end of the room. I think I saw it once as a cloaked figure in black clothes, but usually I just felt it was there without actually seeing it (maybe I was too afraid to look in that direction). I always felt being pulled by that ghost, demon or whatever we call it (a feeling which can most accurately be descibed as being sucked in by a vacuum cleaner or a tornado). My natural reflex in such cases was to close my eyes. Although those dreams were never lucid I instinctively felt that if I didn't resist I would soon wake up. What I find most interesting in your description is your feeling of getting curled up into a ball when the "pulling part" begins-I couldn't describe it any better. I remember those dreams as very disturbing, I think I haven't had them since I was 10-12 or so.