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That sounds like textbook sleep paralysis. I get it too, albeit without the presence sitting on top of me, which, from all accounts, seems to be the scariest part :P It happens when you're either waking or drifting off, so you're in a half sleep state. When you sleep your brain shuts off conscious controls to your muscles, so during sleep paralysis your brain is awake but your muscles aren't. And since you're only half-awake, freaky hallucinations can happen.
It can be pretty scary when you don't know what it is, but for me now it's more annoying than anything. When it happens all you have to do is try really hard to move or speak (speaking usually works for me) and the instant you break it you're immediately fully awake. It seems to only happen when I sleep on my back, too...
Well...I think that's what you're experiencing....but *shrug* I aint not doctor :P
Anyway, I can't really remember any really bad nightmares....mine are usually stupid. There was this one where I dropped this plastic pan I had as a kid and it started rattling....it sounds REALLY stupid now but when I was like four it freaked me out >_>
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I've had similar instances happen to me. Often I am not sure whether are reality or a dream. Like I remember one time where I thought my someone was knocking on the door and I tried everything I could to get up, but I just couldn't move no matter how hard I tried. I tried so hard with all my strength, but couldn't move. Then I kinda just black out, and wake up an hour or so later and have no idea whether someone actually knocked on the door or whether it was a dream or maybe a mix of both.
By mix of both I mean I hallucinated the knocking on the door, but me trying to get up out of bed was a reality. That has happened before with me in about 5 other situations. Some of them is me trying to speak, but I just can't get words out of my mouth. I wake up not knowing if it actually happened.
There's nowhere I can't reach.