That is still happening to me after 7 months but just 3 or 4 nights a week. Sleep before 8PM and up at 4 AM out of sync with everybody. But then I remembered I had always tended to do that even when not drinking, even a a child. I think there is much individual physiology to consider, like what do our bodies do while we are asleep anyway? I read once that respiration and repair to our organs go on a fixed schedule at night no matter what we try to consciously do.