I am no expert but Sophie from about 4 months got into the habit of night feeds, and I, being lazy just let her (her feeds, day or night, were all very short, or 10 mins at the most, from birth). And we were becoming co-sleepers. It was only last months when DH and I were going away for 2 nights by ourselves that I got her to drink a bottle, and it took me so long that I put her entirely on bottles, because otherwise she seemed to take more at night IYKWIM. When we came back I gave her a few feeds, but I decided not to start up again because it had been so hard to get her to take more than 2 or 4 oz (she still takes probably a bit less than she should TBH).
Anyway, the point of this rambling is that I think that with bf it's very easy to feed at night for a lot longer than they need to, which is fine in itself if you don't mind, but in Sophie's case I think it was causing her to wake up more than she ever did as a small baby.
Plus at 1 I would be longing to put her on 'real' (LOL) milk from a carton! Is that what you intend?
My DS2 had reflux and wouldn't eat although gained 'okay' weight, not great. I got very tired of sitting in front of a clamped shut mouth with a spoon in my hand, and I know he would have had milk in preference to food any day, still would, I'd say. Sophie is the opposite, all she wants is red meat!
I hope someone with more expertise and less rambling replies soon!