I'd heard a while ago that natural dips in blood sugar during the night, when you're sleeping thus not eating, can make a child sleep too deeply to wake up when the bladder "signals" and that having a little protein before bed, like a big spoonful of peanut butter, can even out the blood sugar and make it easier to waken. Have no idea if this works or not. Some people may just sleep like the dead, regardless of blood sugar levels.

I don't want to make any of the mothers here despair, but my niece, now 14, still wets the bed. It's more rare now, but she had the same problem mentioned above, she sleeps too hard to wake up, and setting the alarm for two or three in the morning to go potty helped, but sometimes she'd wet the bed before the alarm went off. Her father wet the bed until he was nine or ten, and her grandmother wet the bed until she was twelve, so Mom thinks there may be a genetic or other family-related issue going on.

TrudyP, the double sheeted bed idea is sheer genius, though. Awesome!
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May The Hair On Your Toes Never Fall Out

--Traditional Hobbit Blessing