I have the same problem too. my baby has been waking up every night around 4am. I (or my maid) ended up carrying him hours before he'd sleep tight again. He's very sleepy. But he doesn't sleep well day&night. :-(
i don't think my baby is hungry. he still wakes up for the night milk. and he refuses the bottle after waking up. i know he wants me breastfeeding him. but if i feed him, it'll get more and more difficult to wean.