I wake myself up screaming, saying things like "no" "don't want to" etc. The only thing that has helped me is Prazosin 3mg... but I shy away from taking it... cause the nightmares do come and go and it lowers my blood pressure which concerns me. PDoc wants me to take them all the time??? I have noticed that my nightmares are linked to anniversaries of traumatic events and triggers like smells, seeing something on tv/movie etc. but triggers aren't always conciously noticed by me... takes time to figure out what set me off sometimes.
I wish I had a better answer for you......... but I haven't figured it out myself
But you are definitely not alone with this...