Next day, in the library

The next day, when John arrived, Alice has already waiting for him. Seeing John, she greeted him warmly.

John: "I hope I didn't disturb you from reading."

Alice: "No, I purposely not read anything before you come."

John thought for a moment, then asked: "Can I ask you a question?"

"Sure, why not?"

"Why did you thank me yesterday?"

Alice smiled: "I have a mental disorder called 'Congenital Excessive Concentration'. It causes me to focus on a single thing to the point I become absentminded to everything else for a long time. If I read something long, I'll read it until I faint because of exhaustion."

"Are you fine to tell me this? You and I just met yesterday, and people usually don't tell

"I don't know why, but from the first time I saw you, I felt that you're very trustworthy. I answered your question, can I ask for something in return?"

"Sure, why not?"

"I have some books that I don't dare to read. I want to ask you to 'awake' me if I can't stop by myself."

"Just like yesterday?"

"No, since I pay more attention, waking me up won't be that easy. If necessary, you can use any possible mean."