Explain that you may have been under great pressure (including emotions) in your life and study recently, almost to the limit. I hope you can find out the reason carefully and adjust it in time.
Of course, recently, someone has made you upset, angry and unhappy, so these things appear in your dreams, and even you will feel very scared and anxious in your dreams. Pay attention to the villain and pay attention to traffic safety when traveling.
I usually have this dream when I am in a bad mood or too tired, and I feel the same way. Don't take it to heart, be careful in everything and be patient with others.
(A coffin in a dream generally refers to a villain)