My ten year old had never been dry at night since 5 years of age. Over the last year it has improved considerably, not wet every night, though saying that this week he has so far!
Usually tends to wet early morning(5-6am) we tried an alarm four years ago(via enuresis clinic) very briefly but he hated it and we also had a course of desmopressin from Dr last year didn't seem to help.
Not sure what else to do , he's also beginning to affect him, as he's getting older and school trips/camps etc eventually . Nobody that he has seen medically as ever suggested any other causes..he did have a bladder scan many years ago which showed it was on the small side , he also doesn't have regular bowel movements (every 3-4days), however doesnt seem constipated.