Going to college is definitely different from high school. Going to college means that you have entered the society with one foot. After entering the society, nobody cares, so when I go to college, I feel more conscious. You can sleep at will. This is your freedom. Sleeping in class will bear the consequences of sleeping, because sometimes you can't learn knowledge in class, and then you will fail in the course, which is very likely to make you lose your diploma and degree certificate. This is a very serious consequence. Adults should pay the price for their actions and bear the consequences for their actions. In college, it is normal for teachers not to remind them. After all, as an adult, you should have your own self-control.
In addition, even if teachers sometimes want to remind them, they can't help it, because in universities, especially some public courses, there are many students and many classes are in class together, and a teacher can't even look at a big classroom. Teachers may only see some students in front of them, so most teachers can't remember those students even after teaching a lot of classes. This is normal. It is difficult to manage with too many people. For example, there are two or three hundred students in a class. How can the teacher remind you not to sleep? If I remind you, it will also delay all the students' time. After all, you are sleeping and others are waiting to learn. If I remind you, it will be unfair to other students, so the teacher can choose not to remind you
There may be some teachers who don't like this situation, but they won't force it. At most, I sleep too late at night, Doby. This is already a warm reminder. After they went to college, they mainly relied on their own consciousness.