Wiktionary
bed wetter
n. (alternative form of bedwetter English)
WordNet
Usage examples of "bed wetter".
Karen smoothed the edges of the blanket, and listened to Marybeth Casey carry on about her twins (one of whom was a bed wetter), her husband, Walter (who didn't enjoy being an officer, but night school was just too much for them right now), and how these Division picnics were always such fun because you got to meet new people.
Jeremy was the bed wetter, if I remember-- perhaps the parents didn't appreciate all the effort?