I have been keeping the coop lit for around 17 hrs a day.Cut it on in the morning and off around 8 after I get back from work. Last night when i went out to check on them and cut the light off 3 of the 9 were laying on the floor. They all appeared healthy. This morning I forgot to cut the light on and when I went out there tonight 6 of them were laying on the floor. I cut a light on and they all got up to eat. Not sure what's going on.