My son turned 4 recently and has been out of nappies in the day for a year+. Haven't really tackled the night time issue until this week because he wanted to go without a nappy (they're cheaper than pull-ups!) and with the warm weather there would be no duvet to wash.
He's wet himself every night. If it's about 4am he'll wake up and go to the loo and go back to bed. But I think he sleeps too deeply the other times. Last night we tried getting him up at 11, but he didn't need to go then and just wet himself later.
I'm not bothered because I wet the bed till I was 5, but I'm not sure whether I should persevere or just wait.