A bad night...

Twice last night I woke up feeling like I could not catch my breath. The last time it happened I had been having a terrible dream. When I woke up it was 2:06 am and I had to sit on the side of my bed and force myself to breath through my mouth until I could feel normal again. I remember part of the dream: I was in a room that was totally void of light. You have never seen anything as black as this, a total absence of light except for one small window. There was no light coming into this room, only light on the other side. The window was large enough for me to crawl through, but I could only get my head and arms through, I could not lift myself through this window and there was nothing to pull up on. I tried and tried, but only succeeded in exhausting myself, that is when I woke up. It has been a long time since I've had a dream that frightened me as much as this one, and I have never had a dream that affected my body before like this one did.