He knows that you hated Math. He knows that you are sleepy every time he teaches his lesson and he finds that really intriguing that you hate math yet you still try not to sleep and listen

He wants to see that side of you more and let his discussion be more boring, he is merely challenging you if you'd finally sleep at his class or not. And you did. He went to your desk and tapped your shoulder

Is my lesson that boring? Meet me after school in my office. he says softly yet blunt