This is of course if you dreamed specifically of a dark spirit, dark angels, etc. then these symbols can all have a specific meaning related to each one which can say some very strong things about your life.
If you have a dream about a dark spirit this can be very bad for you, and the more you interact with this dark spirit in the dream, the worse it can get. Going to your dark place is going to the place within you where you house all of your worst and most negative emotions that society does not want to see. If you have a dream in which you see a dark spirit, then this spirit is a direct manifestation of that place within you, it is something from that place and it is of that place. If you are talking to it, it will convince you to do negative things, and sometimes that angry and sad part of yourself is your best motivation. You can't let yourself be influenced in this way or you will get yourself killed, or worse, someone else. Don’t fall prey to the influence of your most negative emotions. Fight for yourself and stand up against it.
If you have a dream of dark angels then this means that you are afraid of the good things that happen to you in life. There are a lot of great things that have been happening lately, but in a spirit of pessimism you are only thinking about what bad might come of it even when something totally good is happening to you. You can’t stop focusing on the negatives. Keep your mind on the positives and then you will stop having dreams in which you are followed by a dark angel.