still using a nappy at 4years old!!!

Night training doesn't always happen as early as day training. You can try limiting liquids before bedtime but his bladder just might not be big enough to go all night yet.

my daughter was 2 when she was fully potty trained at night. the way i started was for the first month i would cut out drinks about an hour and a half before bed and then i'd wake her up about 11 or 11:30 at night to go pee and then she'd be fine the rest of the night. she's only had one accident.

not that easy to get rid since he is 4. mine stopped donning those before they even reached their 1st birthday. how'd i do it? no water before bedtime. a potty near their bed should be ready in case they wanna pee. a water bottle is upon their reach when they go thirsty, so i have this balancing state at night. try letting him pee first before he goes to bed.