I have the same problem. I often scream in my sleep. Occasionally I wake up crying. My husband said several days ago I was screaming “Don’t kill me, don’t kill me”. I probably watched too many episodes of Poirot that day
(I recently got addicted to Poirot and now I watch two-three episodes a day).
I don’t really know why screaming and bad sleeping are going on with me. But I noticed that most of the time it is happening if before going to bed I spend some time online, watch a movie, or go out late (movies, night club, etc). On the other hand, it seems I can sleep better and quieter if before going to bed I go for a walk in a park or read a book.