Well I got many bad dreams in my life for sure. But there's one which I consider the worst and harrashes me once a year or so, since I can remember it in its finest details...
These are the kind of psychedelic dreams, everything flips or disappears, and then appears there and here. The dreams' scenarios tend to change numerous times during the night, and you forget 80% of them when you wake up, so the thing comes when you are aware that you're chaning these scenarios, and running from something you don't even know what is, shoots? bandits? evil? death? .
Add a kind of "glue" on your eyelids that erases your vision, so you're basically running blindly from someone trying to kill you. Then when I wake up I realize, I was trying to stop the dream, in fact, and I "couldn't open my eyes" cause they were closed, but I was trying to.