I keep my feeder mice in my reptile room. They are all in 10 gallon tanks for now, but I've had now 4 litters and they all have been layed at night. I don't cover my tanks up or anything, I do give them tissue paper so they can cover the inside of the nest. I wish you luck on getting some babies and that this may help if any. There are alot more experienced breeders out there that will probably help you alot more....very sorry for any of the mis spelling...long day. Good luck.