My ds was potty trained at 3 and could go all night without peeing when he was 4. He wore pullups to bed for that whole year in between and would wet them a few times a week. I finally stopped putting the pull up on. I think it was a crutch for him. He knew it was there, so knew he was "safe". We had to take the leap and risk the wet sheets. It worked. He didn't wet the bed once after that.
Also, we had stopped giving him any dairy in the evenings. I had read that this makes kids more likely to wet the bed, so a few months before we stopped the pull ups, we stopped all dairy after dinner. That cut down on the number of times a week that he wet his pull up. But the time we stopped the pullups, he was down to only once or twice a week. We have long since relaxed the dairy rule, but his bladder is now big enough to handle it, so not a problem. He will once in a while wake up at night to go to the bathroom, but usually not.
Good luck!
Also, we had stopped giving him any dairy in the evenings. I had read that this makes kids more likely to wet the bed, so a few months before we stopped the pull ups, we stopped all dairy after dinner. That cut down on the number of times a week that he wet his pull up. But the time we stopped the pullups, he was down to only once or twice a week. We have long since relaxed the dairy rule, but his bladder is now big enough to handle it, so not a problem. He will once in a while wake up at night to go to the bathroom, but usually not.
Good luck!