Child A is reading on its bed. Child B is irritated with Child A for some reason and appears mournfully in the doorway. “I’m too tired for quiet reading,” wails Child B. “I want the light off!”
Child B has a flashlight on its bed, and, history suggests, plans to use said flashlight once the lights are out. I take the flashlight and hand it to Child A.
“Here you go! Now you can read, and Child B can sleep!”
Child A is pleased. Child B, not so much.