One of the most common types of nightmares or slightly scary dreams is if you see a symbol of dark hair or anything with that kind of darkness. If this is the kind of thing that you witness, just make sure to go out and see what you can do.
If you have a dream about someone with dark hair then this means that you are thinking about your love life. Tall dark and handsome is a phrase that is normally used to describe what a woman wants in a man, the stereotypical traits that a man must possess if he hopes to be noticed by the opposite sex, yet at the same time there are characteristics just like this that a man has for a woman. A man might not necessarily favor a woman's height in the mate choosing process but he does want to have a woman with dark hair, nice eyes, and a pretty face.
Dark hair is seen as very desirable trait. As much attention as blondes get in high school and college from boys, the ones that end up getting married and finding lifelong happiness are the ones with the beautiful dark hair. If you have a dream about someone with dark hair it is because you are thinking about your love life. This dream usually comes about when you are not in a relationship and you are instead imagining all of the prospects that will one day come to you.