I think that wool is my only option to stop nighttime tummy leakage. I was hoping not to just because it seems a bit overwhelming and expensive. We are currently using S'bish snapless for overnight, so do I just put the wool directly over that? Do I really not need to wash it more than every couple of weeks? How many covers should I get? Do they not stink really bad from all the pee? W is a pretty heavy wetter and goes for about 12 hours overnight.