Avoid falling asleep in the middle on of the class.

All right guys, the best think you can do is focus on your tasks and have an organized mind. Keep yourself busy. Leave some tips I found online. Good luck 

Hold your breath for a few moments. 

Tap your feet and drum your fingers. 

Get up and walk to the bathroom. 

Get a drink of cold water. 

• Participate in the lecture. Ask questions, make remarks, ask the lecturer to repeat or rephrase. Even if the class is boring, you will suddenly find it's not
• If you do fall asleep, accept the consequences and move on.
• Try paying attention. It might be surprising that it actually interests you.
• Get some rest before you come to school!