I know, I know.....I really should know better, in fact I'm beginning to think that I should have taken up truck driving; Max. Duty period 9 hrs or else you are in trouble.
See the link below on Pilot Fatigue:
DasErste Mediathek [ARD] - Plusminus - Flugverkehr: Piloten im Sekundenschlaf (Engl. Version)