My 7, almost 5 week old, chicks have been spending days in their run/coop for a week now, and tonight is the 4th night they have spent in the coop. When I went out to put in their solar nightlight and put them in for the night, they had already gone into the coop and settled for the night. It wasn't quite dark yet, but there they were, cuddled in the corner. Usually they have been cheeping and restless for a while, and the other night they were chasing the bugs that were attacted by the solar light, but not tonight. I guess they had a busy day.