Luka and you are friends. You got used to him falling asleep randomly while you're sitting and talking or just hanging out. That's because he has a severe case of insomnia. The only time he can fall asleep is in your presence, though.

He's a lazy genius and he'd rather sleep in class, than learn.

Today, you're sitting next to each other in class, per usual. His eyes slowly close and he rests his head on your shoulder. He fell asleep. One of his hands is gently resting on your thigh.