My girls will not use their roost. I work nights and when I get home i usually check on them. They are always huddled in the corner on the floor. The roost is high enough off the floor, it's big enough for them to all fit on, and has a ramp for them to get up on. Will this change or have they just become used to sleeping on the floor? I am worried that they will not use the next boxes when the time comes. They are about 14 weeks old and have been living in the coop for 4 weeks now. The only time I have seen them on the roost is when I put them on it.