Nighttime potty training can be a challenging process for both parents and children. Accidents are common, but it's important to know what to do if your child has one. First, stay calm and reassure your child that accidents happen. Have them help with the clean-up process, as this can teach responsibility. Consider using waterproof mattress protectors and encouraging your child to use the bathroom before bedtime. It's also a good idea to limit drinks before bedtime and monitor their fluid intake throughout the day. Remember, accidents during nighttime potty training are normal and shouldn't be cause for frustration or punishment. With patience and a positive attitude, your child will eventually master this important milestone.