My DS can hold on for hours, and hasn't wet his nappy at night since he was just under a year old (still wears one though!). We've been potty training for a couple of weeks, and he will use the potty or the toilet, knows when to go etc. Do I just keep a nappy on at night just in case, and if so, until what age? Went to buy nappies yesterday and somewhat resented spending £6 on something that'll only ever be 'just in case'!! He always wees when he gets up, but not in his sleep.