Help for Bed Wetting?

I have a son who just turned 5 year old who still wets the bed almost every night. We currently put him in Pull-ups, but he often makes so much pee that it even leaks out of the diaper onto his clothes, sheets, blanket, etc.

Does anyone have suggestions or advice on how to handle this? Do we just wait for him to hopefully grow out of it? We've been careful to give him lots of fluids during the day but not allowing him to drink anything for the last 2 hours before bedtime. He always goes to pee just before he hops into bed for the night. When we wake him up to use the toilet about 3 hours after bedtime, he's often already wet his diaper. I'm getting really tired of having to change his bedding every other night, those Pull-ups are expensive (even the generic brands), and our water bills are way high from all the laundry that results. Lynne