The involuntary loss of urine that occurs at night is called nocturnal enuresis.  10-20% of American children experience nocturnal enuresis through age five.  After age five, 15% of these children per year resolve spontaneously.  Enuresis tends to run in families.  In 70% of families with on enuretic child there is at least one other memboer of the family that is also genetic.  If both parents were enuretics, or wet the bed as children, there is a 77% chance of enuresis in their offspring and 44% chance if one parent had a history of wetting the bed.  Nocturnal enuresis is generally a self limiting condition but can be treated prior to its resolution with medical therapy and behavior modicfication.  The complete evluation and treatment for nocturnal enuresis, better known as bed wetting , should be completed by your urologist to rule out any organic causes and ensure proper management.