B.F.
Congrats! That is awesome that you BF for so long! If I were you I would try getting them a cold sippy cup of milk. Are they both in the same bedroom? If so, I would put them in their cribs awake and read stories in their room. or you could all sit on the floor in their room. I would start a new bedtime routine...like with the milk give them a snack for them to hold while you are reading books.(on the floor) wouldn't give food in the crib. But that might have them busy eating while you are reading. If it's just a cup I would start to put them down in the crib awake so they get used to (and learn) to fall asleep on their own.
Good luck, I know my daughter didn't sleep thru the night until I quit BF her at 14 months.