Probably he's having a growth spurt and he'll go back to twice a night after your supply catches up with his demand, but in order for you both to survive until that day, you need at least one full four-hour sleep cycle at night.

Fortunately, you have a partner. Arrange with him which hours the boobs will be offline. When Junebug wakes up during those hours, his other parent has to take him out of the room and do his best to comfort him without food.

Wishing you all some sleep.