Oatmeal for breakfast. After about an hour and a half, you will really want to eat, which is explained by the chemical properties of this porridge. When you feel like grabbing a snack, eat a sandwich or two prepared ahead of time with hot coffee. Further according to the situation, at 13:00, for example, you can have lunch. This practice will allow you to solve two problems: 1) Be energized. 2) Do not overeat in the morning, which will cause heaviness in the stomach and the desire to go back to bed.
You need to get enough sleep and have a good breakfast. The problem with students is that they don't sleep properly and don't eat properly. True, I think no one will heed my advice.)