Wikipedia
GoodNites (Formerly Pull-Ups Goodnites) (Known as DryNites in the UK and some other countries) are disposable diapers designed for bedwetters, and are the leading brand who offer products to older teenagers who still require the use of diapers to manage their bedwetting.
They are intended for use for children and teenagers from four up through 15 years of age, to be worn to bed in order to prevent wetting of the sheets and pyjamas in case of an accident. They are pull-up style rather than tape-up to make it easier for the bedwetters to change their diaper on their own, though of course some parents are more comfortable changing their child or teenager's diaper themselves. Once wet, the sides of the diaper can be torn apart to be changed. According to the website there is no reason GoodNites can't be worn during the day by children and teenagers who experience daytime wettings as well.