For some reason, every time I sleep on my back I have a nightmare bad enough to wake me up, and then I can't move, which is worse. I've tried to get my husband to wake me up, but he can't tell anything is going on while he's asleep.
Most of the time, I dream I'm in the same house. It looks different every time, but it feels familiar. It's MY house. When I have the nightmare, I'm in someone else's house, also different everytime, and there is a presence hostile to me. When I wake up, I'm still partly there, and I can't move until I'm completely together again.
I avoid my episodes by not sleeping on my back, avoiding stressful situations and violent movies before bed, and trying to figure out early on that it's a dream and I make the rules. During an actual episode, however, I can't do a thing. I think I may have dragged myself out of bed once, but I gave up trying to turn the doorknob and went back to bed, and by morning I couldn't tell if I'd actually gotten up or not.
I also don't remember feeling or smelling anything in particular during an episode, but it could be that I'm too panicked to notice. I do, however, feel and smell things in my dreams.
I hope this is some help. It's a horrible experience.