Last two nights i've keep having nightmares and when i woke up, there always scratches, cut and sometimes bruises. why is it and how to make it stop?

REM behavior disorder: Or a dissociative disorder with amnesia. I would recommend that you see a sleep disorder specialist first and have a rem behavior disorder ruled out. Then you should see a psychologist who specializes in dissociative disorders for a complete evaluation. You may also see a psychiatrist who specializes in dissociative disorders as well, but they are fewer and farther between.