He regained consciousness after a couple minutes, insisted he was fine and refused any additional assistance from me, or at the gate upon landing. I hope he continued to do well, and did not wind up like the patient described by the OP. That flight was a red eye, and I didn't sleep a wink the rest of the flight, worrying about him.
He seemed to sleep just fine the rest of the trip though.
That has to be frustrating for a physician to deal with. He slept well. Maybe he was dead tired.