All kids wet the bed, the trick is managing and not letting them think its a big deal or you can make it worse.
1, waterproof undersheet x 2 for late night quick change
2, make sure they try and pee just before going to bed even if they say they don't want to.
3, only give them a drink up to an hour before bed if they ask for it and then monitor it to sips.
4, watch closely to see if there is an underlying problem like nightmares or bullying.
5, tell your wife that you don't mind staying up late just in case you are needed as long as she can do the morning shift to make sure she gets a decent night sleep, now this is genius(though I say so myself)because you get to play COD until the early hours at the weekend and get a lie in and get thanked for doing it.