His mom would wake him & then find him asleep on the bathroom floor with the shower running.
I hate to report that he's not much better as an adult. This is one of those issues that irritates me, sometimes a lot more than others. I have to herd HIM along whenever he has to be anywhere early. Grrrrr. (He doesn't have ADD or ADHD, but he's procrastinator with horrible sleep habits.)
I hope your dd improves with age. I think most do, even if my dh has not.