Hi December, it is so hard, i know just how you feel my ds can be the same but its often just at different stages he'll have a couple of good weeks 'sleeping through' then a few bad weeks feeding alot during the night and im not sure why...it prob would be better if ur ds ate more during the day but its hard to break the cycle. maybe if you know he's had enough milk try and strech him out during the night so he might be hungrier during the day??
sorry i'm not much help, but wanted you to know your not alone!
hope it gets better for you!