I have seven chicks that are 16 weeks old and 22 chicks that are eight and a half weeks old. They are all integrated and getting along just fine now. Last week I turned the heat lamp off (I know, I kept it on too long!) and now they won't put themselves to bed. I find them outside, hunkered down for the night. When I go out there in the evening to close up the coop I have to put them in the coop. We live pretty rural and our street light is not at the street, but brought back to the side of my house, which lights up a big area including their run. I think it's just too dark inside and they won't put themselves to bed. Should I put the lamp back on but on a timer? How do I teach them to put themselves to bed?