I dreamed that I was sitting on the train, but slowly I found that the car behind me was getting farther and farther away from the car in front, so I sat in the car in front.

There are two possibilities for dreaming. First, you think about it all day and dream at night. Second, you don't sleep well. Try some foods that help you sleep. Third, don't be superstitious. Curiosity kills cats. Superstition will kill you.

Of course, dreams are also a direct psychological appeal. The life you face makes you feel at a loss, and you dream that your school is yearning for that innocent era.