My son just turned 10 months old today and I was having the same issue where he was still waking up for milk in the middle of the night. It had gone down to only once in the night since he was 8 months old but still waking up once. My sister (who is a mom of 4) thought maybe my son wasn't getting enough food during the day so when I decided to work on him not nursing at night I fed him one last time in the middle of the night the day before I began and then started giving him a lunch (which I wasn't doing before, just a snack) and then making sure he was getting enough breastmilk 4 times a day. It was amazing that once I added the lunch (I was putting milk in his meals as well to ensure he was getting enough), he didn't need the nursing in the middle of the night.
He was waking up out of habit, I think, but I would sneakily go into his room, put his pacifier in his mouth and after a little bit of whining he would fall back to sleep. Not sure what you would do if your son doesn't take a pacifier to calm him without him seeing you because I know that once my son sees me it often takes longer for him to fall asleep than if I just leave him to soothe himself to sleep (crying or whining). As long as he wasn't screaming I would let him cry a little, cause usually it was a sleepy cry that he would lift his head, then lay his head down again and I knew he was really tired and fighting it. It took me about a week or so before I got him sleeping through the night and then of course he started getting a tooth so he woke up a few more nights but I continued to do the pacifier and leave him alone and now going on 4 days he is sleeping through the night.
I think it's an ongoing battle with the waking in the night thing due to teething and other issues that could alter their nighttime sleep, but as soon as you stop feeding them in the middle of the night they more often than not will lose that habit.
Good Luck! I'm still working on things but as soon as I saw that he could make it through the night without nursing, I knew that he was able to do it even on the days that he was crying, I guess I just needed to see it to believe it before I would full force go forward with no more nursing at night. I'm so glad I did and I think he is getting much better sleep because of it now, which makes him happier during the day.