My 5 week olds have been out in there coop for a week now. At first I would put them in there hen house that is off the ground with a ramp. Of a morning I would open the door and they all would come out by themselves. However, they will not go up the ramp at night to enter the hen house. They are sleeping on the ground and I'm afraid they may get too cold or sick. Our little roo goes up and down the ramp all day long but they will not go into the house?????