No real advice, but wanted to post and say that you're not alone. I have 2 boys, one of whole is almost 11 and still wets the bed about once a week. My other son is 9 and also had bedwetting issues but has outgrown them (maybe at age 8 or so).
My son is a heavy sleeper and he snores. We've had a sleep study done, but it came back inconclusive. We've done the limit liquids after dinner thing, but it didn't help one bit. We've tried waking him up midway through the night - also didn't work (he'd either wet the bed before or after we'd come for the wake-up, even if we made him get up and use the toilet). We elected not to go the medication route, but that is our family's choice. Our doctor mentioned it, but said often kids go right back to bedwetting if they stop taking the pill.
We've never tried an alarm...maybe we should.
Karen
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Mom to 2 hockey-playing, Lego-loving boys DS1 2003 & DS2 2005