I don't go to school. I always dream that I go to school again. What happened?

Because there are still memories of your school days in the depths of your brain, maybe you have many memorable things, and many people and things that once made you happy are unforgettable. Maybe you miss them, but you are busy at work now and don't have time to miss them, but in your dreams, you can vaguely emerge, maybe similar, maybe the same, maybe you forgot something, but what triggered it, maybe you didn't care.