Sounds like you and I had a similar experience. I'm pretty convinced mine wasn't a paranormal experience but rather some sort of waking dream of the likes I've never had before, and hope to God I never have again. By the sound of it, this may be what happened to you as well.
Here's my experience:
Just recently I was lying in bed and I felt someone next me. They slowly pulled my covers off of me and injected me w/ something into my ribcage.
I'm not sure if it was textbook sleep paralysis b/c I didn't try to move. I was paralyzed by fear, and all I could do was pray over and over again
that I would be safe and live through this. After a couple of minutes it all stopped. I noticed my covers were still on me and no one was in my
room. I laid there for 30 minutes totally freaked out trying to figure out what the heck just happened. I finally gained the courage to turn the
lights and TV on; I forfeited that night's sleep. It was some sort of sleep paralysis I guess. I haven't slept on my back ever since for fear of
falling into it again - just felt so real - you have to experience it to understand it.
[edit on 11-9-2007 by hbdale309]