Nook's DreamSheet just got a little dreamier. Meet Waterproof DreamSheet Full. It's like a fitted sheet and mattress protector in one! Designed with our patented raised Pebbles to keep your child cooler at night and a waterproof backing to protect your mattress from leaks and messes. DreamSheet Waterproof ensures a supremely soft, no-spill snooze on any Full size mattress.