Your body will get on the same schedule as your baby, just give it some time... If your baby no longer wakes in the middle of the night, then after a while your body will no longer porduce milk over night... There for problem solved... But don't worry about other feeding times, say he wakes at 7am everyday and wants to eat right away, well your body will know that, and your milk will be there.... So don't worry and just try to deal with the leaking for now.... After a week, maybe a little more, it will get better
also have you tryed to "empty" your breast right before you go to bed? Feeding or pumping can help....
Good luck