My son has this problem too....the last milk is at 12mid-nite, then he will wake up n cry at 3 or 4pm...sometimes cries very seriously. I observe and notice that it happen everytime when we bring him out to place where lot of people e.g. Jusco, Mall. Guess he is not used to crowdy place so had a bad dreams at nite.
Same as your bb.
My son is also 戒左夜奶(本來)! But in the past 2 week, some time will wake up at three and cry for milk. Properly feeling cool and also easy to get hungry. 咁涷大人都食多啲啦!