Just curious why I havent had a nightmare in like 10 years (Im 22). I've had one or more dreams about the following during those years:

-Stabbed my father
-Stabbed my brother
-Strangled cats
-Killed babies
-Raped women
-Sniped people
-Shot people
-Knifed people
-Beaten people to death
-Executed people (military style)

None have really been a "nightmare". In fact, the only dreams that made me feel terrible afterwards was the cat-strangling dreams and the dream in which I stabbed my father and brother, but I woulnd't call them nightmares...
As for the other dreams, I was unaffected or even enjoyed it (I enjoy my killing dreams). And no, Im not a diagnosed psychopath so skip that crap. Why don't I have nightmares and most importantly, why do I have these dark dreams? I haven't had a bad childhood or anything (it was great) and I haven't been thru anything traumatic - I just don't like people.