We've had to wean the night feeds a couple of times (after my daughter was sick on two occasions, she would suddenly get her appetite back and wake up for night feeds and then keep waking up after she was recovered).
We had great success with a plan that I read about here (and is stickied at the top of one of the forums somewhere, but I can't remember where ....) where we slowly decreased the amount of food she was getting at night. I wasn't comfortable using PUPD when I knew she was actually hungry -- because she was eating at night she wasn't eating enough during the day and then would be hungry at night. I knew she actually wasn't eating enough because she was bottle fed by that time, so it was very easy to tell when she wasn't eating enough.
So, she was drinking 8 oz at night. We dropped it to 6 for three nights, then 4 for three nights, then after two nights of only 2 oz she stopped waking up at night. It probably takes longer than PUPD, but I felt better about it. Plus, she went back to sleep really quickly after eating (since she was waking due to hunger) so the NWs weren't that bad.
I believe you're BF, so it will likely be a little more difficult, but I believe other moms have just decreased the nursing time every few days, or limited it to one side, then reduced the time, etc. I'll see if I can find the link ...