It is 43*F tonight and it's not supposed to get below 41*F. Paisley and Sage are almost 3 weeks old. They are in a chicken tractor. The walls are covered with plastic. They have a rabbit cage inside the tractor, also covered in plastic, lined with hay, with a heat lamp over it. It is plenty warm in the rabbit cage and draft free. They just won't stay in it. They prefer to be out in the tractor. They can get into the rabbit cage and do go into it willingly sometimes. Will they be alright? I'm just a bit paranoid. I don't want to lock them in the rabbit cage because there is no food or water in it and I don't them to over heat. But having access to the cage to warm up, they will be okay overnight, right?