Annabelle, my smart Wyandotte is moving herself off the roost the nest in the middle of the night. 3 nights ago she even laid an egg in the nest in the middle of the night. I've also seen her on top of the nest box in the morning, which is almost 5 feet high. I make sure all the girls are on the roost before shutting the door. It's 100% pitch black in there. I guess she knows her way around pretty well. I've never heard of chickens navigating in pitch darkness.