sleep walking

We have a sleep walker! The other night Mike heard one of the kids in the kitchen, so her went to investigate: He found Joel standing by the table with a bottle of Ketchup up to his mouth with his head tipped way back! Mike asked him what he was doing and he replied getting a drink. mind you nothing was coming out of the bottle. Mike asked him if he had enough and he said no and tried for another drink, and still nothing. Mike got him a drink of water, he chugged the whole glass done and walked off to bed! I guess we will have to start putting a bell on the doors so he won't go outsisde.