I think that there's a bit of waiting it out involved but to help him know the differance you could try to make night-time feeds differant to the day-time ones ie keep the lights as low as possible and the mood peacefull and calming. You could try doing the night-time feeds in the room that he sleeps in rather than taking him to a differant room.
If you can have a nap or two yourself through the day it might not feel so exhausting getting up so often in the night.