One part of me would love not being able to wake up as I'd have so much time to do whatever I wanted. I've never experienced it though and I'm pretty sure a small voice in the back of my head would whisper something like: "You're trapped here forever" if it would happen.

Have you tried turning those nightmares around every way possible? If you have I'm sorry for you. Must be hard to watch something you love turn into something unpleasant.