Nursing to sleep

Right now my baby only falls asleep when he's nursing. Which works totally fine right now, but if I set him down and he wakes up I have to start over. Or if my oldest wakes him up (which she does frequently) I have to nurse again to get him to go back to sleep. Between feeding him and trying to get him to sleep I feel I am always nursing. Which means I can't get stuff done around my house. Any suggestions on how to get him to sleep with out wanting the boob?