We have some chickens coming up on 11 weeks old, and we would like to not have the heat lamp on anymore. So, we are having a nice warm night and thought that tonight would be the night to try it. We let everyone in the coop, got everyone settled, and turned out the light. We did leave a little night light on. You could hear the terrified peeping outside the coop with all the doors closed!!! We went in to have two of the pullets immediately fly into the chicken wire trying to get to the light. We ended up turning on the heat lamp for them, even though the coop is pretty warm. Everyone settled right down on the roost and all is quiet. Is it too late to get them used to the dark, or will our chickens always need a light on? Will having the light on at night throw off day/night schedules? We do have a roo that hasn't started crowing yet. Thanks!