Matthew is a very heavy wetter as well, reading your posts Rachael is like reading my own experiences!

Good news is we have found a solution - disposables, we use the Aldi brand, with 2 Bebe's nappy inserts in the nappy. The Bebe's Nappy Mates can be found in Safeway, we have also used Huggies, Baby Love and Home Brand nappies and they all work well. On top of the nappy, we use a wool cover. It may sound extreme but it is the only thing that works disposble wise.The wool covers from Baby Beehinds are fantastic

Since we are heading down the full-time cloth route, we also use a VSBN with the extra doubler. In this we also use a hemp booster that we got from Baby Beehinds and a PUL or wool cover. Make sure the nappy is fully cover by the cover.

We had to wait a few weeks of using and washing the VBSN for it to work. We did find that Baby Beehind nappy's didn't work (but I may not have found the right combination of nappy/boosters) and that it really makes matters worse that Matthew is a tummy sleeper. I don't think it has anything to do with bed wetting Rachael Also, it doesn't really matter how much he drinks before bed...

Good luck