Anybody know where you can find pj's with ons/zipper in the back?

My 2 year-old wakes up during the night and when we don't respond to her crying, she throws everything out of her crib and then takes her diaper off. I have tried everything to keep a diaper on her at night. Even if she were ready to be potty trained, I am not ready for 2 year-old twins to be on the loose at night. I am at a loss and am having trouble finding pj's that on or zip in the back.