I have one 10-yr old son & one 7-yr old son. The 10-yr old still wears a pull-up at night, while the 7 year old has been dry all night since he was about 2 1/2. We've tried waking him up at night, didn't work. We've tried medications, which helped a bit in the beginning, but as his body got used to them, they didn't work either. I've talked to his doctor extensively about it and done a lot of research, and the bottom line is that he just sleeps so heavily that his mind doesn't register the fact that he has peed until he's fully awake in the morning. Our doctor tried to talk us out of the medications and just leave it be to sort itself out, but my son really wanted to try it, so we did. We're going to try another medication this month, because he has a week long school field trip coming up in January and is really concerned about it. Our doctor's advice is to realize that it's really common in boys, particularly, and not to stress it too much early on, because you don't want the child to feel that there's something wrong with him that needs to be fixed, when it's a matter of the body growing. Those that say it's a personality thing or that kids should just be able to make a mental choice to stop are uninformed. As far as using the pager, our doctor's advice was to evaluate whether a dry bed and no pull-ups was worth the entire family getting no sleep.
I remember my brother having this issue until he was 11 or 12, and my parents woke him up 2 times a night every night until that age (no pull-ups back then). He still frequently had accidents both in his bed and various places throughout the house when he would make an effort to wake up to use the bathroom, but he was just such a sound sleeper that he would end up peeing in the closet if no one was guiding him in the middle of the night. He also would have a hard time at school because he wasn't sleeping soundly. I guess what I'm trying to say is that if you go down that road, it might work out great for you, but it might also be unsuccessful, leave your child feeling like a failure, and guarantee that no one gets any sleep...