First of all, the reasons for being sleepy during study can be divided into objective factors and subjective factors. The objective factors that affect your study may be the study environment, mental state and physical condition. I have a deep understanding of these. There are two large study rooms in the library of our school. A room is air-conditioned all day, so the doors and windows of the study room are closed. The other study room has no air conditioning, the door is wide open and the window is open, which is convenient for everyone to enter and leave. I started studying in the air-conditioned study room. Who doesn't want to study comfortably? But often after sitting down for a few minutes, I feel dizzy and my head wobbles and falls asleep. I've seen it several times, and it's always like this. I decided to study in the study room without air conditioning. Sure enough, things are much better. Apart from staying up late occasionally, I am sleepy during the day, almost full of energy, and my learning efficiency has also improved.