I have 2 almost grown chicks that won't stop using the nest to sleep in. The older chickens have the top roost, but the young chicks won't use the lower one (it is out of bombing range). I tried shooing them out, spraying with water, air horn, letting them spend the night out. Nothing works. I don't get home until after dark so I can't block them out after the mature hens have laid their eggs. ????