Still not sleeping through the night

OK, I heard from an online friend of mine that her daughter is sleeping from 9 pm to 7 am every night without waking up. She is almost exactly the same age as Melina. What's up with that? Melina still wakes up about twice during the night to feed. The friend's baby is eating solids and formula, and sleeps in a crib; this may be the difference. Melina is breastfeeding and sleeping in our bed, and has just begun eating solids. Apparently, babies who sleep in cribs sleep longer. I'm thinking it's about time to make that transition, because I need more sleep. I've been continuously sleep deprived for about 2 weeks; before that I got a few good nights of sleep, and before that I've been sleep deprived for five and a half months. Actually, no, longer than that, because I couldn't sleep when I was pregnant, either. Anyway, I like having M. in the bed with us - it's nice to wake up to a little baby. When I wake up in the middle of the night I just look at her sleeping peacefully, and that's usually relaxing enough to get me back to sleep. I think it's good for her, too, to be next to us as much as possible for these first few months. However, this sleep deprivation has got to stop. We haven't bought a crib yet, but perhaps we should start looking for one.