Hello! I've got two hens that are happy and healthy, but due to the cold weather and despite the fact that I've got the coop well covered, they've taken to sleeping (and pooping, ugh) in their laying boxes instead of roosting. Naturally I don't want to eat their eggs when I go to collect them and find them sitting on top of a pile of poop. I've tried putting things in the boxes at night to block them, but as soon as I stop doing it, the hens are back in there, nested up comfily. Is this normal? Also, am I worrying too much about the safety of the eggs? Any advice on how to stop this habit? Thanks so much!