My son is going to be 4 on Monday, and is still in night time nappies. He has been potty trained since 2.5 so I really thought he would be dry at nights by now but he has a wet nappy every morning. I have tried star charts, limiting liquid intake at nights, and just removing the nappy to see if he was only wetting it because he was there. None of this has worked.

Does anyone have any suggestions?