I use a light on a timer - turns off at 9:00 each night. My girls lay like they did before the time change. They have always done this untill it get really cold. oh, I am in SC so it is still pretty warm here.
I have already found this site very helpful. We have a small flock of 5 hens 1 rooster. Had them about 18 months now.
Look forward to reading more of the posts.
God Bless