My husband and I put our girls in the run about a half an hour before dark (after they have been free ranging for most of the day). They usuall huddle up together, but sleep in the run under the coop. I had chalked this up to the heat (here in the high desert it was in the high 80's at 10 oclock last night). But last night we ended up running late and getting back after dark-and they were all inside the coop. We've noticed them do this another time. Why would they put themselves inside the coop, but avoid it if we herd them into their run???!!