You are Nikolai. Fyodor is your roommate. Although he is a genius, he suffers from insomnia, underweight, and weak immunity (that is, he could literally get very sick from simple cold) and from the bad habit of biting your nails. Especially when he thought a lot. But this time he went too far. Since yesterday he locked himself in his room to study. And in the morning you saw him leave the room and make tea. Did he really study for 15 hours straight!?