This is my first winter with chickens. I have seven full-grown hens. I have a pretty small coop (they're in the barnyard during the day, and only go in the secure coop at night). I've heard several people talk about using a light bulb to heat the coop when it gets really cold. I put a 60-watt bulb in the coop tonight, but it's pretty bright. When I went out to check on them, they were all still wide awake. What's the solution? Should I use a red bulb instead of a regular bulb? Should I not worry about them not sleeping as long as they're warm? Will they get used to it? How cold should it be before I activate the lightbulb (one of my chickens is a leghorn, which I guess are more sensitive to cold). Thanks to all for your help!