My son is almost 3 years old and we finally have day potty training down. We have not had a daytime accident in a while. I am now trying to work on night-time training. During his nap he sleeps in underwear and still has frequent accidents. I have recently had him wearing only underwear at night (he used to wear a pull-up), but he wakes up 1-2 times a night wet. If it is too early for him to be night-time training, what should he be wearing instead of a pull-up? Changing his pajamas and sheets every night is a bit too much work.