An 11 year old who wets the bed should initially be evaluated by his doctor to rule out rare causes of enuresis. Assuming no medical problem is found, there are a variety of training techniques. The most basic is for the child to limit drinking liquids in the evenings and empty his bladder immediately before bed. Some suggest waking the child once or several times during the night to use the bathroom. Medications can be effective, but typically only as long as the child takes them. They can be convenient for sleepovers or overnight camps. The most effective training for lasting dryness tends to be a bed-wetting alarm. Be prepared that this may take months, but ultimately, it has been shown to have the most success.