Totally agree that POTUS is borderline workaholic. He keeps a schedule and hours that would cripple a man half his age.
However, I smell a chess game afoot.
What if: there is a lot of planning and things going on that cannot be made public now. E.g. the take down of the DS coming up (remember all the sealed indictments).
These stupid people love to underestimate POTUS. They have not learned yet. They might never learn.