So this has only been happening for a couple of days, right? Do you think it could be a growth spurt? Waking BEFORE the dreamfeed and then again overnight makes it seem the likely culprit to me... I would give it a couple more days to see if it settles before panicking or anything. He might start eating more during the day on his own or it might just settle down without him really taking in more ounces. Breastfed babies often don't eat any more ounces as they get older after a certain point, but the composition of the milk changes.
If, after about 4 or 5 days, it's no better, then you might be looking at a sleep problem. Have his naps or his schedule changed in any other way? Is he teething and could that be waking him?
Keep me posted, but I'd be inclined to just ride it out in the short term and see if it's a glitch! :? Good luck tonight!!