lilbean - have you tried swaddling? My lo likes sleeping on his side or tummy, but I'm too freaked out to let him do that while I'm asleep, but we swaddle and I've noticed he tends to sleep more deeply while swaddled.
When you ladies are saying they're sleeping 4,5,6 hours, does that mean actual sleep? I count mine from start of a feed to start of a feed, so when he goes 5 hours, that's really only about 4-4.5 hours of actual sleep. But a couple nights ago Ninja went 6 hours between feedings then 4!!! That was our best night yet! He usually only goes 3-4 though, with some 5 hour stretches mixed in here and there. With #1, he went 3 hours between feeds until 6 months, so I'm thrilled that Ninja has been giving me longer stretches! But he was doing 4 hours in his first few weeks, so I was hoping that by now he'd be consistently giving me longer stretches. With the longer stretches though, he's been feeding about every 2 hours during the day, instead of 3-4 like he used to. Now that my nipples aren't killing me, I can handle that if it gives me more sleep at night!