I integrated my three 3 month old hens with my existing flock of six 1 year old hens. They are free ranging the majority of the day together and have shared a common pen with no major issues. This is all their second night together in the same coop. Tonight I found my three young hens sleeping in the nesting box. I put them on the roost with the big girls. Why are they not roosting by themselves and how do I prevent them from sleeping in the nest boxes. I want them all to roost together.?