My 9-week-old bantams are still sleeping huddled up in a pile in the corner of the henhouse at night and ignoring their roosts. During the day they hang out on the roosts, so I know they're not too high or too big around for them. Why don't they sleep there? Will they learn to on their own, or do I need to teach them somehow? They're sleeping in the nesting box now, which will become a problem when they finally start laying eggs....