I've recently had a bit of a problem with one of my young birds trying to sleep in the nesting boxes. I can't just shut them off because I have one 7 month old that is laying. My younger ones are 14 weeks. Interestingly it's not always the same bird but it seems to usually be one of two of the younger ones. When I go out to close up the coop after dark I boot out whoever it is and they then get up on the perch and spend the rest of the night there. There is enough roosting space. And really once I evict them from the nest box they are fine. Anything else I should be doing?