We did it the same time we started day potting training. We cut diapers cold turkey when my son was 3. We put about 2-3 layers of waterproof mattress pad and bed sheets so if he had an accident at night we could easily peel off a layer and have fresh sheets underneath. Then I’d wake him at 1130 and 2am to pee. We kept the potty by his bed so literally I got him out of bed, took off his pants and set him on the potty (we kept lights off so he wouldn’t fully wake). The whole thing took just a minute to do. He got consistent with no night accidents in about a week. So then I just woke him once at 2am for another week or so. We also go commando bc undies feel too much like diapers. He was completely night trained in about 2 weeks. We also limited his water intake leading up to bedtime.
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