I think they call them night terrors.

I had such a bad dream last night that I actually cried in my sleep. Aren't there songs about that? Too bad I can't sing or else I would write a song about it. And it would be pretty deep. And when it was done people would say, "I feel that song. I felt that" "That's deep".

But then again I can't sing, therefore I probably can't write a song. Aw shucks.