How to stay awake in class when it is hot? I am a graduate student now, and I can't concentrate in class. What can you eat to relieve it?

Take a nap at noon and apply cool oil to your temples. After class, you can go to the pool to wash your face, eat more fruits, such as oranges and apples, and drink some tea soaked in chrysanthemum peel. Eat spinach, which is rich in magnesium. When the body is short of magnesium, it is easy to feel tired. Magnesium can convert carbohydrates in muscle into usable energy. And you should pay attention to sleep time. I am also a graduating class. I slept well at night and didn't feel tired after reviewing all day. I also often eat fruit and drink chrysanthemum tea, take some mints with me, and eat a tree when I am tired.