Potty training and night/naps

I havent got to the potty training stage yet but have heard many people say that night time dryness is dependent on hormones and is not something that can be trained. It is apparently a concern only after the age of 5.

Nap yes. Night no. Oddly he was dry at night for a few weeks after we trained and he insisted I take him in the night so I kept doing this but maybe he figured out he wears a pullup and sometimes he uses it
He drinks a ton of milk at night so I'm sure he would be dry if I stopped that but I need some sleep! He's the worst sleeper ever it feels like.

I read at 2.5y they should have enough of the hormone that stops you peeing at night to have more of a chance. So I plan to night train in April.

If it doesn't work after a month I will try again in a few months 🙏

I don't think you just take the nappy away and hope for the best though. You have to teach them to yell for you in the night that they need the toilet. You have to be prepared to take them at all hours. It's a good idea to stop fluids 1h before bed and make them do a goodnight/good nap pee before sleeping.
I do that aside from the liquid restriction but still he uses nappies half the nights. Some nights he is dry and he almost always goes on the toilet about 2h after first falling asleep

The book I read had a method for slowly pushing that midnight pee back to later and later but tbh its not achievable for us right now. Because of back to back nursery illness. Bedtime is not predictable or consistently at the same time 😭 so that won't work. Involves too much mum maths!