How do you stop them?
Start by collecting eggs often, so they have none to sit on. When you get one that wants to set in a nest overnight, pull it from the pen immediately and put it in a small pen or cage with a wire floor so it cannot build a nest. When they stop clucking they are ready to go back with the flock. In warmer weather they can be dunked in cool water to hasten the process. Ever heard the phrase, "madder than a wet hen?"