Never mind the pilot may have slept all day at home, got a 4-5 hour nap prior to their 0400 departure and will be in the bunk 45 minutes after takeoff for another 4 hours
Actually he had spent the day flying with the reserves. And he was on probation. And was showing for a 15.2 hour MEM-DXB leg.
The other guy, the one not on probation, may have been sleeping all day, though.