Medical and pediatric literature highlights nighttime potty training as a neurological milestone, with most children achieving dryness at night as their brain matures and bladder grows. Simple practices like peeing before bed and upon waking can help. About 15% of 5-year-olds still wet the bed, declining rapidly thereafter. Intervening at age 7 may be necessary. Encouraging dryness in younger children is challenging and lacks evidence regarding bladder muscle development claims. Using pull-ups can ease the process for both parents and children.
https://parentdata.org/should-my-child-nighttime-potty-trained-age-3-5/
