My 5yr old has never been dry at night, and sleeps very heavily so nothing wakes him (even a wet bed) I've been doing it 6 weeks now, and have 6 out of 7 nights dry! The first few weeks the alarm went off and it didn't feel much like progress, although did give us an insight into any patterns of when he had an accident. Then suddenly at about 4 weeks, he just started having the odd dry night. Then a week later we had a run of 5 or 6 nights. It's still touch and go if he's drunk loads near bedtime and he doesn't always wake up from the alarm still, but something has definitely changed for us to get to this point.