For some reason, my chickens won't go in their coop at dark. They go in and out during the day so I know they *can* get in. Instead, they huddle together by the door and wait for me to go get them and put them in. I wouldn't care, but they are still young, about 6 weeks, and I have two 250 watt red bulbs in the coop. So. Do I let them "camp out" if they don't go in on their own? Thanks!