I have an A-frame coop with a bedded roost in a "second story" that has a ramp to get in the door, the lower level is just dirt (inside chicken wire). I had to replace 3 of my 4 hens in August due to a dog attack; they get along with the original hen but the three new ones do not go into the roost at night. Previously all 4 did. The 3 new ones do lay eggs in the roost so they do go in, just not to sleep. That was ok in warmer weather but now that my Ohio temps are going sub-freezing, I would like them to sleep in the roost. I do have a light in the outer part of the coop for warmth and egg laying, so that may be a contributor but like I said they were staying outside the roost even in warm temps before I turned the light on. Any suggestions for how to get them to go into the roost at night, or anything else I need to consider?