You can set up a basking lamp, if its an inescapable laying bin. Seeing as your in MN, it might help keep the temps in the right zone. What I usually do is use like a 60 watt incandescent a little higher up than what I would normally do for a basking lamp, just so I can see and she can see, you don't want her completely in the dark, plus it adds a little heat as well.