I agree that you should take the pull ups away. You're sending him mixed signals. Yeah, it's a pain in the butt to have to wash sheets every morning, but it won't happen for long, and then he'll start getting up at night to go to the potty. We used to use pull ups for about a week before I realized that it was setting our little one back. Then I would just help my daughter for a little bit by going in and getting her to the potty before I would go to bed myself. Once she had a routine set up, she was able to get up all on her own. Before the invention of disposable diapers and pull ups, there were no issues with potty training children. Just because it's convenient and popular, doesn't mean it's the right way to do it.