This is probably how the brain processes information. If dreams bother, frighten, dream regularly for a long time, then it is better to consult a specialist. If you are puzzled and hypochondriacal thoughts, then you should not wind yourself up)
Of course, I won't say one hundred percent, but I think that everything is fine with the person. Well, who in childhood did not dream of horror stories? Sometimes dreams are just a figment of our imagination. It is unwise to judge a person by them. Yes, there are certainly prophetic dreams. Black and white, rainbow, truthful, unreal ... different! Dreams are not an indicator. The only thing I can add is that if a person has unpleasant dreams, then most often he is loaded with something in real life. And to get rid of his bad dream, it is likely that you just need to get rid of the problems in reality.