Besides, does dreaming bother your mind? If it's just some normal dreams, it's not nightmares that will cause you fear and anxiety, but it doesn't matter. Dreaming is a process of subconscious activity. If you like to interpret dreams, you can take this opportunity to explore your inner secrets. I recommend you to look at Wu Zhihong's Sina blog, which contains a lot of knowledge about dream interpretation.
You should check whether you have encountered any major events recently, which make you upset and anxious. Get rid of it quickly, or find a way to calm yourself down in the face of it.