I fell asleep because I was too tired during the day, and the dream I had when I slept was actually an illusion. It is actually very difficult to fall asleep during the day, as everyone who has worked at night knows. Even if you are tired from sleeping during the day, you will always think about it when you sleep, so the dreams you have during the day are basically inaccurate. Because our biological clock is to sleep well at night and not well during the day, the dream of sleeping during the day is not allowed, and there are many elements of thinking.