L.O.
I don't have any advice about how to stop it, but I did want to let you know you are not alone. My now 18 month old did the same thing. He still will wake up to suck 1-2 times per night but for the most part will sleep MOST of the night. Have you tried giving your little girl a binki to suck on? Some babies just have a need to suck (which actually, studies have shown decreases the risk of SIDS..at least that's what my doctor told me). My little boy wouldn't take a binki or a bottle, so that wasn't an option for me... but if you haven't tried it yet, it may give your nipples a break. =) Good Luck.