Do you ever dream feed before you go to bed, that helps sometimes, gives me a bit longer anyway!
Its hard when they are at an age where they can just pull your top down and feed, Kynon does this and makes a mm mm sound which turns into a moan then a scream.
Hope there isn't anything wrong with him though that's stopping him sleeping. I think some babies just don't sleep so much. Hang in there, your not alone xx