Secondly, your sleep time is not suitable. If you go to bed late at night and don't have enough sleep time, you can only make up your sleep during the day. This is a vicious circle.
If you want to improve this situation, I suggest you force yourself to go to bed immediately after school at night. Even if you are not sleepy at all, you should lie down. /kloc-form a habit in 0/5 days and stick to it, and you will gradually adapt to your new sleep time.
Finally, I want to emphasize that sleeping in class is entirely due to inattention, inattention, and inattention to a certain extent is also due to lack of sleep. Therefore, while insisting on the new sleep time, we should also insist on class concentration. This is a good way to take notes. First of all, record all the knowledge points that are not in the book. Second, if you have something to do, you won't feel bored and distracted in class.