Hi R.,
Wow, someone else out there who has early risers! Glad to meet ya. :-) I will say Amy H's post is pretty accurate from my experience. BOTH my girls would do whatever necessary to wake me as early as possible. I found that pushing the time for bed back slowly helped tremendously. Another option I tried was shortening one of the two naps my daughter took.
About the nighttime feeding, something that helped me was giving some form of a warm solid right before bed time ie: oats, or fruit, along with a nice nursing session. It seemed to relax them, and fill them enough to sleep a little longer. I also was told that between 4 and 6 months (depending on the child) the nighttime feedings can go. They should be nourished enough to make it through the night. The easiest way I found to stretch the periods out between nursing is similar to the bed time trick. When they wake for mid-night feedings wait a few mins more each time before you nurse, until she begins to wake in the morning at the time you want. Sounded crazy, but my Dr. knew what she was talking about. Good luck!