This is the first time anything like this has happened to me. I was asleep dreaming some random dream of me in my car with someone I have never met driving it. Then, I'm not sure if it was in my dream or not, but I was awoke by a female voice saying my name. It just said my name once and I was wide awake. It wasn't long or drawn out, just short like someone trying to get my attention.
I awoke and moved my head back and forth looking around my room. I looked left because that's the direction I heard the voice, but saw nothing so I turned my head right and all of a sudden it looked like a shadow had reached its arm across me and pinned me down. The shadow was angled as if it were standing on the side of my bed hovering over me. It looked like one arm on each of my shoulders holding me down and then its head was face to face with me.
There was no definition in the face or body, it just looked like a shadow. Its head was moving up and down rapidly, towards my face then away. I squeezed my eyes closed and tried my hardest to move but nothing happened, I tried to scream but all that came out was a few moans/grunts. It lasted maybe 10 seconds and when I opened my eyes again it was gone and I could move.
Immediately after it happened I wasn't scared anymore until I sat there and thought about what just happened. I have read about REM but not convinced since I was moving my head, legs and arms when I awoke right before it happened. I checked the shadows around in my room to see if maybe I had mistaken the arm and face for another shadow but my ceiling was half way lit up by a light on my radio. I also looked to the side of my bed while it was happening and noticed that it had no lower body, as if it was an upper torso. I didn't feel like someone was touching me but I could not move a muscle. I do believe that when I squeezed my eyes shut I turned my head to the left.
I'm not exactly sure what time it happened but by time I gathered the courage to get out of bed and turn the light on, it was 6:08am