We got a goodnight's sleep with DS. He would nurse every 2 hours, but by 10 months he would just latch on, nurse a litlte bit and go back to sleep. I was pretty much sleeping through it.
We stopped bedsharing at 14 months because I was pregnant and my milk supply dropped and DS wouldn't sleep, he'd just nurse all night long, like hours trying to get milk out. So at that point we weren't getting enough sleep.
DD is 5 months now and she comes to our bed from the bassinet at her first wake up. Then she nurses once more during the night, again, I'm barely awake and she nurses and falls asleep within a few minutes.