Just that, really! DS seems to have spontaneously night-trained aged 4 (just). He has been reliably dry during the day for months. His nappy is almost always dry when we take it off in the morning and when it’s wet (maybe once a week/ten days), I think it’s because he’s actually weeing on waking rather than in his sleep.
Did you wait until you had, say, a week or two weeks of dry nappies before removing them at night? Or did you take a different approach? He hasn’t been the easiest child to train (ahem) so I think part of me doesn’t quite believe it!