So every night, around the same time, I clean the kitty litter. I drag the litter box out from under the table, take the lid off, and then step back and wait as by this time both my boys are sniffing around and will take turns peeing and pooping. For two young cats they produce an awful lot of waste, and they seem to wait until it's time to clean the thing before they let it all go!!!!! Do any other cats do this?