Narrative:

At the end of a 12 hour duty day on the last leg of the flight; I fell asleep while en route from ZZZ1 to ZZZ. I started duty at XA30 local from ZZZ and flew through the night. Total flight time is just over 6 hours for the night. On the last leg around XL30 local time near ZZZ; I apparently fell asleep. I do not remember feeling sleepy or the need to try to do activity to stay alert. I had the autoplt on and was cruising at 6000 ft MSL. When I woke up; I was approximately 15 mi past the ZZZ airport. I turned the aircraft around and made contact with ATC. I was then vectored from the south for a visual approach to runway 10. Upon landing I was given a phone number to contact approach with. After shutting down the engine and unloading the cargo; I proceeded to call approach on the phone. I spoke with a controller and explained to him that I had fallen asleep with the autoplt on and overflew the airport. He then requested my phone number in case there was a need to contact me so I provided him with it. He then told me that because I had not left ZZZ airspace; he did not believe there would be an issue. That was essentially the entire conversation that we had. I believe factors contributing to this occurrence are that I am a reserve pilot with a changing schedule. I had been on a day schedule 2 days prior to this flight and switched to the night schedule 2 nights before. Fatigue was probably a factor in that I work long hours and get 5-7 hours of sleep a night. Contributing to my fatigue is that I had flown the previous 6 days consecutively. Also; my father is having surgery on the day of the incident and my wife is 9 months pregnant with our first child.

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Original NASA ASRS Text

Title: PLT FALLS ASLEEP AT CTLS AFTER LONG DUTY NIGHT AND OVERFLIES DEST BEFORE WAKING UP.

Narrative: AT THE END OF A 12 HR DUTY DAY ON THE LAST LEG OF THE FLT; I FELL ASLEEP WHILE ENRTE FROM ZZZ1 TO ZZZ. I STARTED DUTY AT XA30 LCL FROM ZZZ AND FLEW THROUGH THE NIGHT. TOTAL FLT TIME IS JUST OVER 6 HRS FOR THE NIGHT. ON THE LAST LEG AROUND XL30 LCL TIME NEAR ZZZ; I APPARENTLY FELL ASLEEP. I DO NOT REMEMBER FEELING SLEEPY OR THE NEED TO TRY TO DO ACTIVITY TO STAY ALERT. I HAD THE AUTOPLT ON AND WAS CRUISING AT 6000 FT MSL. WHEN I WOKE UP; I WAS APPROX 15 MI PAST THE ZZZ ARPT. I TURNED THE ACFT AROUND AND MADE CONTACT WITH ATC. I WAS THEN VECTORED FROM THE S FOR A VISUAL APCH TO RWY 10. UPON LNDG I WAS GIVEN A PHONE NUMBER TO CONTACT APCH WITH. AFTER SHUTTING DOWN THE ENG AND UNLOADING THE CARGO; I PROCEEDED TO CALL APCH ON THE PHONE. I SPOKE WITH A CTLR AND EXPLAINED TO HIM THAT I HAD FALLEN ASLEEP WITH THE AUTOPLT ON AND OVERFLEW THE ARPT. HE THEN REQUESTED MY PHONE NUMBER IN CASE THERE WAS A NEED TO CONTACT ME SO I PROVIDED HIM WITH IT. HE THEN TOLD ME THAT BECAUSE I HAD NOT LEFT ZZZ AIRSPACE; HE DID NOT BELIEVE THERE WOULD BE AN ISSUE. THAT WAS ESSENTIALLY THE ENTIRE CONVERSATION THAT WE HAD. I BELIEVE FACTORS CONTRIBUTING TO THIS OCCURRENCE ARE THAT I AM A RESERVE PLT WITH A CHANGING SCHEDULE. I HAD BEEN ON A DAY SCHEDULE 2 DAYS PRIOR TO THIS FLT AND SWITCHED TO THE NIGHT SCHEDULE 2 NIGHTS BEFORE. FATIGUE WAS PROBABLY A FACTOR IN THAT I WORK LONG HRS AND GET 5-7 HRS OF SLEEP A NIGHT. CONTRIBUTING TO MY FATIGUE IS THAT I HAD FLOWN THE PREVIOUS 6 DAYS CONSECUTIVELY. ALSO; MY FATHER IS HAVING SURGERY ON THE DAY OF THE INCIDENT AND MY WIFE IS 9 MONTHS PREGNANT WITH OUR FIRST CHILD.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.