I don't understand what the math teacher said. I want to sleep as soon as I have math class. You can't blame mathematics itself. The way is to think, think and think again. You should realize that thinking itself is the greatest happiness of mankind. With some experience, some gains, and some creativity, I can't sleep anymore. At present, you sleep because you have no thoughts in class. It is suggested to solve the problems raised by the teacher independently as far as possible. If it is difficult, it is recommended to arrange it yourself.