atakacs,
can you sleep whenever you want to?
That plane arrived at 0605EDT after 10 hours of flight. I am too lazy to look up the time difference, but it can't be much from ATL to GIG. That means the flight left arround 8pm. Now if that pilot got up at 8 in the morning, he might just simply not have been tired until he had to leave the hotel.
That happens a lot on long haul flights, and it even gets worse when large time differences come into play...
Nic