Bedwetting, or nocturnal enuresis, refers to the unintentional passage of urine during sleep. Enuresis is the medical term for wetting, whether in the clothing during the day or in bed at night. For infants and young children, urination is involuntary. Wetting is normal for them. While bedwetting can be a symptom of an underlying disease, the large majority of children who wet the bed have no underlying disease. In fact, a true organic cause is identified in only a small percentage of children who wet the bed. However, this does not mean that the child who wets the bed can control it or is doing it on purpose. Children who wet the bed are not lazy, willful, or disobedient.