I keep having this recurring nightmare.....help!!!?

It always starts of the same way. Always in a different location, aka where I'm at that night. Like my old apartment, my house, a friend's house etc. The very first one started at my old place. At the time i was living with 2 friends. I was laying in bed watching a movie as i fell asleep. The next thing i know there was a black shadow hoovering over me. Then it dropped down on to my body. It pinned my wrist down and my legs and started to choke me and well beat the **** out of me. I was screaming and yelling for my roommates. But nothing would come out. So i continued to fight with it still screaming. Then it pushed me off my bed and i was floating over the floor then it threw me into the closet door. I woke up after i hit it. Now whats extremely weird is when i woke up i had marks on my wrist neck and legs. I could barely talk and the same movie i fell asleep to was in the same exact spot when i woke up from the dream. It freaked me out, because the place i was living at was haunted. So when i moved back home with my parents i still have the same dream all the time. No matter where im at! Also my old roommates, and their new roommates have the same dream but just with different outcomes. But mine is more reoccurring then theirs. So any information on it would be great!