At 15 weeks the girls decided to roost on the branch in the run area at night and not go into the coop. The run is fully secure from predators. The weather has been hot 90s in the day but cooling down to 60s at night. Up until now they were going in at night. We went out of town for a few days and had to leave the door open. Is there a reason I should make them go inside to roost at night?