If the child is older, have them strip and change the sheets in the middle of the night. Not as a punitive measure, but to become more aware.

The Last Night of Ballyhoo.

It's really more a question of educating the parents, instead of trying to train the children.

If a child is still wetting the bed when he's 8, it's usually simply because he sleeps very soundly.

Parents and children alike need to understand that a child cannot be trained to stop wetting the bed. Parents often offer bribes or rewards in an attempt to get kids to not wet the bed and become frustrated when they fail.

My own eyes are no more than scouts on a preliminary search, for the camera's eye may entirely change my idea.