Bed-wetting is involuntary urination during sleep in children. Typically, children become able to sleep through the night without wetting around ages 3 to 5 years.

Enuresis is bed-wetting at least twice a week. There are two types of enuresis:

  • Primary nocturnal enuresis (PNE)—no periods of nighttime dryness
  • Secondary nocturnal enuresis (SNE)—periods of nighttime dryness longer than 6 months followed by bed-wetting

Urinary System in Child
si55551330_96472_1_UTI Children fact sheet
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Bed-wetting is common and not usually related to a medical condition.

Some factors that may contribute to bed-wetting include:

  • Bladder control that develops more slowly than normal
  • Greater than average urine production at night
  • A tendency for deep sleep
  • Overactive bladder

In rare cases, bed-wetting may be a symptom of a health condition. These conditions may cause excess urine or prevent the bladder from completely emptying. They include: