My little ladies should begin laying soon and I had a question about lining the nesting box floor. As of right now, my nesting boxes are boarded up so the girls don't use it to sleep in. I have a foam mat secured to the floor of each box but wanted to put something on top. I use pine shavings on the main coop floor and wanted to use something different. Any suggestions? Hay? Straw? Any help would be greatly appreciated.