patience and a cool head. If you treat the wetting as an accident then so will your child. Is your child a boy or a girl? I know some studies have shown that boys are sometimes going until the age of 7 before they are completely trained, especially at night.
One thing you can do if you are already canceling night-time drinks, is waking he/she up in the middle of the night to use the bathroom. If you notice that he/she is still having problems contact your pediatrician to see if there is some study your child can be entered into to see if he/she is sleeping too deeply to feel the urge. If that's the case there are monitors that can be used to gently wake your child to remind them to go to the bathroom during the night until they train themselves to wake up automatically.
Good luck, I know how frustrating it can be, my own son is about to turn 4 himself and is just now completely potty-trained.
at 9:12 PM on Dec. 15, 2010