B737-800
Flight Crew Air Transport Pilot (ATP)
Fatigue
Deviation / Discrepancy - Procedural Other / Unknown
General None Reported / Taken
Company Policy; Procedure; Human Factors
I was scheduled for a 12+ hour duty day on day 2. We taxied out for takeoff the second time after receiving additional fuel for the reroute. I thought I was fit to continue. I realize now that I never should have gone. To even make that decision after a long duty day is totally against any NASA sleep study regarding safety. My physical and mental states were compromised. Duty days should never be scheduled so long without rest if safety is important. No violations were made but it was only adrenaline keeping me going. My original Captain called fatigued after the first leg because they had an early go two days prior. The new captain was thrown in last second after a deadhead from ZZZ1 with pressure from ramp and the company to go quickly. It was a 14+ hour duty day in the end. Then there were issues with getting a room. The next morning I woke for the deadhead and could not see clearly for hours; was losing things and could not focus. I would never accept a duty this long again. It was a poor decision made when tired but not recognizing how tired I was.
B737-800 First Officer described compromised physical and mental state resulting from fatigue due to long duty days.