Well, we're on a roll with causes of bed wetting theories. Here's one that seems to make sense. I'm still pretty much sold on the idea that it's a hereditary issue - but it seems like if there are other causes of bed wetting, they may be more controllable. If it's just heredity, you kind of have to wait it out until your child reaches the pre-set magical age of dryness. By nature not especially patient, the idea of waiting it out doesn't appeal to me.