This age is still pretty young, and bedwetting at night is still common. It can vary from child to child when they reach this milestone. My first son was instantly night dry when he potty trained, but my second oldest son was not, and took a while to get there. I still have my 3 yo girls (who have been potty trained for a while) in pull ups at night only. They usually wake up dry, but on those occassions they don't, we are covered. They get a full night of sleep without waking up frustrated and wet if they do have an accident. I wouldn't worry about it too much - he has at least a few more years before it would be an issue. It's great he potty trained easily!