We put a ton of waterproof sheets on DSS's bed.
And just let him wet it.
He would help change it in the morning.
We set up a reward chart, but didnt punish or anything for wet nights.

He didn't stop wetting the bed fully until he was 6. But I know that he could from a few month before he turned 5 (he would wake and lie in bed and wee, get up, change his pjs, take his sheets off and go back to bed- there was a nanny cam in his room- easier to use the toilet lol), he was just lazy (his mum is very whatever about this stuff) about it.

(We discussed waking him once during the night, but he is a horrid sleeper so we decided against it to save our sanity.)