While I tend to guess this is a kid issue, I can see how intense kids who can get very focused could be more predisposed to this.
I do want to suggest for those of you who have issues with nighttime dryness the alarm system. My DS potty trained pretty much in one day at about 2.5 (and with no real "training") and has had maybe 3 daytime accidents ever, however he was not dry at night consistently until we used an alarm. He urinated so much that he would pee out of overnight pull-ups by midnight, I was changing his sheets 3-5 times per week. What we discovered using the alarm was that he slept very very heavily. However one month with the alarm at age 6 and he was finally dry at night (we had dramatic results within about 2 weeks, and kept using it another 2 weeks to reinforce). He got sick this year (right about age 7) and had a night time accident but we just used the alarm again for a week and voila, all better and no problems since (he turns 8 next week). It was an issue for him because he was starting to be invited to overnights.
I would not suggest the alarm for kids under age 6, because it requires pretty good dexterity to turn off, and is very loud and can be scary sounding. But, our Pediatrician kept saying he would grow out of it, but my research suggested that if a kid wasn't normally dry at night by age 6, then there was a good likelihood he would not be dry by age 12, and I didn't feel like that was a very good outcome.
