Until you wake up in the morning.

Hey. You should get some sleep now. You have an early start tomorrow, don't you? It would be a shame to finish it all tonight. Place me between the pages. Now, sleep. I'll wake you up tomorrow. I've written a nice song. It's called "The Pigeon and the Boy." I'll let you listen to it tomorrow morning. This is a bookmark that seems to speak to you. "You know, the culprit is the protagonist's boss, Matsuda-san." It might say mischievous things like that, so please be careful when reading mystery novels.