I have 3 and 4 week old chicks in a brooder box that I have made out of a giant rubbermaid storage container. We have 2 pekin ducks in the same set up. 2 nights this past week we have awakened to find the waterers completely empty and the bottoms of the crate full of water. Same nights, same thing, both crates. Weird. They are both right next to each other, in the back room of our house which has a concrete floor, doors shut and no other animals. Any ideas what could be happening? Would it hurt to not have water overnight?