The EXACT same thing happened to us right before the 9 month appt. The dr said, "She's playing you. You have to stop." So it was a rough few nights. We reduced that 4 am bottle each night until we just gave her a bottle of water. She was so mad, but it did work. No more wakings for us! It turned out it wasn't hunger, but she was looking for comfort. She sometimes wakes between 4-5am now and whines a little, but puts herself back to sleep. I was going crazy trying to figure out if she'd had enough food throughout the day.
LOL our doctor said the same thing because my LO started doing this around 9 months old! My LO knew I'd come running if he started crying and I did! I even fed him one night because he NEVER wakes up crying and I didn't know what to do. Turns out it was a little seperation anxiety and picking him up just made things worse AND made him keep doing it night after night. Pedi suggested I do in, rub his head, let him know I'm there but then leave the room. He eventually stopped waking up after a few days and went back to his normal routine. Kids!