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You won't be surprised to find many students sleep in class today, especially in the math class. When the class is over, we can see many people wake up all together.

Many of them say that they actually don't want to dream in class at all as it's such a shameful thing to dribble when the teacher is solving an equation.

In fact, students always fall asleep unconsciously.

Some of the students maybe go to bed late, but I think they could still stay active if the teacher chooses to interact rather than keep cramming only. Now the schedule in our university is so tough that there's always too much to learn in a single class. There's no time to take a deep thinking, no chance to communicate, no need to take notes since there're sides to download. Then what to do in a 2-hour-class? Listen to the teacher without thinking, students will soon begin daydreaming.