Night time dryness, is not something that is BIOLOGICALLY attained, until even 7 years old, and is normal.
Pull-ups, is USELESS for night time, because it does not hold much and leaks. It is not made, to be used for night time.
My son is 4, and uses a night time diaper for night time and naps.
My daughter, was already 5 and still was wet at night, slept like a rock, and used night time diapers. No biggie.
She even had a dream once, when she was 7.... that she WAS on the toilet, until she felt herself wet.
I just use waterproof bed pads directly under my kids, then the sheets do not get soiled and it is easy clean up.
Night Time dryness... is a physiological/biological maturity, of the organs and brain.
It is better, for a child to get sleep, than be woken up, to go pee. That is just me and what I do with my kids.
Everyone is different.
My daughter, before she was 6 years old, then had the bladder maturity and development... to 'know' when to get up and go pee. On her own. But... she still had night time pee accidents here and there... until she was 7. She is 8 now, and is now 'really' much more aware. And has very rarely, miss cued, her needing to get up and pee at night.
My son, is 4... and still has not gotten there.
No biggie.
Per our Pediatrician, this is normal.
Until 7, night time wetness, happens.
Some kids are even longer than that.
My Husband, had pee accidents at night, even older.