i dont have nightmares at all, but i have a friend that have nightmares every night, really vivid ones, and is the most terrifying shit that i ever heard.
is not the casual ones like behing chased or something like that, is he seeing all his family and friends getting butchered and things like that .
is kinda funny the contrast between my dreams and his dreams, i ussualy dreams things of my life, like if i watch a anime, i normally dream about it.
does that have a meaning? cuz he say that he always had those nightmares, since childhood.
Nightmares often stem from something causing psychological distress (which may or may not be repressed in waking life), like fear, trauma, or suppressed feelings/desires. Dreams tend to be highly symbolic, so psychoanalyzing someone or even yourself based on a surface-level interpretation is a bad idea. Violence in dreams may be an expression of something totally different.
I don’t know your friend, so I can only make wild guesses here, but him dreaming of his family and his friends being butchered could stem from a fear of losing them (especially to death) or a feeling of helplessness manifesting in a horrific way.
My first thought would be childhood/baby-time trauma. In any case, there must be a reason for all those night mares! Perhaps therapy like emdr or eft tapping could help your friend. Good luck!