We just recently overnight potty trained dd at 2 1/2. What we did with her was cut off all liquids at least an hr before bed and made sure she went potty right before climbing into bed. For about the 1st month, Dh or I would wake her up right before we went to bed (2-3 hrs later) and put her on the potty again. We also put her little portable potty in her room and told her if she needed to to potty in the night she could go right there. We also never did pull ups...just went straight to underwear. The 1st 4 or 5 days I was washing sheets daily, but we've only had a coulpe accidents since.