Nathan is three and a half, and is fairly well potty trained during the day. But--we still put him in pull-ups at night because every time we try to get rid of them, he wets the bed. He even wets sometimes during naps. Am I being wimpy to let him stay in pull-ups? I'd love to not buy them anymore--should I just be more firm? Or is he still young enough that he must might not be ready? I'm not sure. We have a similar issue with Rachel (and she'll be five in April), but I've kind of assumed it is one more of her many physical issues. Any ideas?