My chickens have a light on in the coop 24 hrs, but since the cold nights of 20's and 30's they have stopped laying. Last night they chose to sleep outside in thieir fenced in yard instead of in the coop. I have no idea what to do. Should I put them inside at sundown myself? Also, the coop has a small door open for them to enter and exit into their fenced-in yard and I do not know whether to close them in for these cold nights, or to leave it up to them to go out or not. Is it too cold in the coop for them? Any help would be appreciated!