If you often dream, and the same dream appears many times, it is normal. I have a similar experience, maybe everyone has it. Even if you forget it in other ways, it will appear in your dream, just a deformed life thing! Even some real things happen in life, you feel like they happened in a dream. They are so alike that people are so scared!
In order to prevent such things from happening frequently, we should stay up late less, exercise more, have reasonable nutrition, communicate more with people, pay attention to study and think more about problems, which can actually relieve most of the stress and reduce the number of dreams.