I have had my little flock of 3 birds since early October. My girls are about 24 weeks old. This is my first time with chickens. They have a coop that is enclosed in a secure run. Their food and water are in the run. The coop has a door I made and they know how to use it (clear floor mat cut into flaps that I trained them to use). I don't think the door is a problem because they used it with no problem until recently. In the last couple weeks, I have noticed that they are not leaving their coop until I go entice them out in the late afternoon - today it was 2:30 before I decided this behavior can't be good. It's been cold and I assume they just don't want to get off their cozy roost. At first I was telling myself that they will leave the coop for food and water when they need to, but I'm getting worried. Should I go make them get out of the coop in the morning? Will they self-regulate food and water? I appreciate any advice.