Every now and then I get this dream (god I hope its a dream) where I'm sleeping. I'm sleeping and I just woke up, and I try to get out of bed. As I try to move out of bed there is this semi-visible force holding me down. I usually try to move my arms first, but there is a resistance, like they are being pushed back down. It is a clear physical sensation of being forced down. As I continue to struggle the force starts taking on visible characteristics. I usually see an outline of a form. Sometimes it will manifest sinister looking eyes, and jagged teeth. Occassionally it will taunt me with the voices of my freinds and familly.
Sometimes I succeed at moving against it. I will sit up sometimes and others I will actually find myself taking several steps away from my bed, just to find myself back in a prone possition being forced back down a moment later.
Other times I will realize that I am dreaming, and open my eyes. I'll go for a glass of water or something, just to get half way to the kitchen before appearing back in my bed. I only dreamed that I woke up.
I guess the worse part of this dream is that the force feels so real, it really feels like i'm resisting a downward pressure inorder to move. . . that and the fact that for the first several seconds after waking up, I'm still not convinced I'm awake.
Dude, that's just sleep paralysis. Your house isn't haunted. Sleep paralysis happens to almost everyone. It happens to me at least once a month. It's terrifying yes, but it's nothing supernatural. Your eyes are open, but your brain is still in REM basically. Audio and visual hallucinations from your dreams merge with your real-life surroundings. Read this link:
Since you suffer from sleep paralysis, it probably means you're a light sleeper. If you're really concerned about it, I've noticed it never occurs if I leave a light on for some reason. Also, try to lower your stress and sleep on your side (as opposed to face up).