There is a storage loft in the top of the chickens' coop. (See this thread: https://www.backyardchickens.com/forum/viewtopic.php?pid=1544085#p1544085) We use it for keeping litter up there. (We don't want to keep their food there for pest reasons.) Ever since they were little, our RIR hen oddball and our rooster Blackie have been sleeping up there. Are they going up there because they are cold? (It doesn't get below 25 degrees in their coop.) We have plenty of roost space, so I know that's not the problem. What is going on? Is there a problem with this, or should I let it be?