D.S.
I personally don't have this problem with my kids however my sister has this problem. She had 6 kids and her middle 2 have this problem. One is 13 and one is 7. They have to wear pull-ups at night. They have been to the doc and there is nothing wrong they just don't wake up. They have tried the less fluid and waking them up at night but after a few years that gets really old. They will EVENTUALLY hopfully out grow it. The doc said one day it will just stop for no reason. I know buying costly pullups is not what you want to hear, but sometimes that is all you can do.