Their bodies adjust to the increased fluid intake and restroom issues level off. Emit happy thoughts. If teachers aren't smiling, that's a problem. Our schools don't come close to providing the input the brain can handle. There ought to be borders with quotes around the ceiling, posters on the walls, items from nature, music of all kinds, etc.
Teachers are often concerned about the 'tacking on' nature of such things.
Rotate posters through the classrooms that have positive values and words of encouragement. Mozart's music is called 'classical' music. Next time play Beethoven from the clasical period or Bach from the Baroque period. Stimulates the brain and increases background knowledge. Just because students don't pick up Kidnapped and read it independently, doesn't mean they won't be intrigued by the wonderful language and images created through the read aloud.