Bedwetting, also called, Nocturnal Enuresis, refers to involuntary urination during sleep in children over the age of 5. The word enuresis is derived from a Greek word meaning "to make water." Many children who have achieved daytime dryness with potty training continue to struggle with bed wetting for years. Nighttime bladder control is considered the last stage of potty training and can take some children a little more time to master. Wetting the bed before the age of 6 or 7 is considered a natural part of development and tends to resolve itself over time and a single episode of bedwetting is typically not a problem, even in an older child.