My girls like to sleep in their nest boxes, which makes the bedding very dirty by the time they start laying eggs in the morning. During the summer they were using the roosts but now that it's cold they like to pack themselves into the small spaces (often more than 1 to a box). I've tried putting the perches "up" to block the entry, but that doesn't stop them -- they either knock the perches down or by pass them all together. They have the roosts, they have deep litter, they prefer the boxes. Any ideas? And if I should somehow manage to block their entry into the boxes at night, how do I get them unblocked for laying short of going out to the coop at 4:00 AM?