What I did with my now four year old was to make up a back-up bed for him and leave him fresh/dry pjs. The mattress was covered in plastic, so there was no possibility of urine soaking into the mattress. I left the heater turned up a bit higher than usual. (So he didn't need more than a sheet and light blanket as a cover.) And he also had a small pillow (rather than the standard twin sized pillow, because they take FOREVER to dry!)
I didn't ever wake my son up to use the bathroom. I figured he needed to get as much sleep as possible so he could learn to wake up when his body started telling him his bladder was full.
When he wet the bed, my son would initially wake me up to tell me. In those early days it was a big production to get him and the bed cleaned up. Then I decided that there was no need to go through all of that effort in the middle of the night. His sleep was disturbed. My sleep was disturbed. And for what?
After that revelation, I just told him to change out of his wet things and jump into his back-up bed. (He has a bunk bed - so both beds would be made AND we had a spot on the floor with a comforter, etc. for when he was wetting the bed more than once.) I wouldn't get up or do anything else. Pretty soon, he'd get up, strip of the wet clothes, put on the dry clothes and crawl into the other bunk bed and/or the back-up bed without really even waking all the way up. (So, instead of a 30 minute ordeal to wake me up and have me clean up and make his bed before he could get settled back down - he just stripped out of the wet things right away and hopped into his other bed. He'd be back asleep within five minutes.)
The following morning, he'd help me strip the bed (beds) and put the wet sheets into the washer. Then he'd use a Lysol wipe to clean the mattress. That night he'd help me make the bed. We definitely didn't offer him a reward for staying dry (because he didn't have any control over this - it takes time to learn how to wake up to go to the bathroom!) And we never berated him or said anything negative or positive about wetting the bed. It was just a fact of life to be dealt with.
In a relatively short time, we only had one wet bed each night. Then, the quantity of urine in the bed started decreasing. He'd wake up AS he was wetting the bed and would run to the bathroom to finish emptying his bladder.
It was quite a bit of laundry at first BUT we did manage to cut down on the size of the laundry loads by turning up the heat and using a small pillow. The transition took a bit of time, but he's four and a half now and we haven't had a single accident since maybe a month or two after his fourth birthday.