This is a very common problem indeed. It is known as enuresis. Try a Star chart.For every night that he does not wet his bed give him a star on a special chart that you should make. If he gets 3 stars in a row he will get a small reward., but even if he misses 1 night he does not get the reward. If this fails to help after a full month of trying, take him to your paediatrician as he is old enought to start treatment for enuresis.
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