My dd is almost exactly the same age right now. About 3 weeks ago, we started to encounter the same prob and then day sleep tanked also. I realized dd was needing more than breastmilk and started solids. That helped a little but didn't solve the early am rising. My dd takes a df at 11:00 and I realized that 5 or 5:30 was at least 6 hours after last feed so maybe it was hunger?? I started to feed her at that time and she would take a full feed and zonk out until 7:00am. I only resorted to that after a couple of weeks of sh/pat for 2 hours in the am, working to increase my day supply for bfing, etc. So far, the 5am feed has solved our little problem. HTH.