What's antidiuretic hormone function?

Anti-enuretic: Anti-diuretic hormone, or vasopressin, is produced in much greater levels at night and when we are lying down flat, thus making the urine produced at night more concentrated & allowing most of us to sleep uninterrupted during the night. It is marketed as a medicine under the name ddavp (desmopressin). When used properly, it is a very effective treatment for bedwetting.