Nighttime bedwetting

We recently managed a week of dry nights, but for the past 4 nights our little boy has wet the bed between the hours of 2 and 6am. He has access to a potty and we always limit his liquid intake before bed and make sure he goes for a wee beforehand. Not sure why he's regressed after having had a dry run! Does anyone have any tips? We don't really want to put him back in pull-ups unless we have to, as he proved last week that he's capable of holding it, but at the same time there's only so much changing of sheets in the early hours and washing a girl can take 😅