Add a sleep timer to stop reading
Many readers enjoy reading a book before they go to sleep. Having a configurable sleep timer would let users read until they fall asleep without losing their place in their book. Ideally, the app should make a bookmark of some kind when the book stops reading so the user can pick up where they left off the next time they open the book.
I believe that you can do this by going to the clock app the setting a timer and changing the sound to "stop playing."