Thanks for that info. I will try that. Last night one of the hens was on the outside roost, the other 3 were in the coop. I did have a light in there, hoping it would draw them in. I unplugged that. I tried the nite light, but it kept blowing out the bulb. Not sure why. I have to buy a new one, and I will put it on a timer. Thanks so much for all your help.
I should have said "northern" rather than "western" hemisphere.