That powerful force is actually pressure. You are afraid of him and feel physically, which shows that, first, the exam is coming and you are nervous; Second, the quilt is heavy and uncomfortable.
It has nothing to do with Halloween, but a short dream caused by physical and mental tension. The subconscious mind generally doesn't tell you the truth directly, but borrows a saying. Qingming is a common saying, and the truth is tomorrow's exam.