Narrative:

This fatigue event was a result of scheduling a reserve pilot for an evening coverage and then resetting him to an early morning event. All of my times are in local east coast base time. I was scheduled for xa:00 short call. After I received my assignment [the day before]; I looked at the weather forecast for the day of my short call and realized there is significant winter storm that is going to hit the mid-west. Knowing that delays in [mid-west] can affect all our operations here; I slept in longer that I normally do; and I also decided to take early afternoon nap to ensure I am ready to potentially fly an all nighter as I didn't start my short call till xa:00 and was covering the evening push. Little after xa:00; I received a call from the scheduler notifying me that I was being released from my short call to a xm:15 field standby [the following day] at our cross town airport; bwi. I explained to the scheduler that I shifted my sleep cycle and it will be extremely difficult for me to get any rest to be ready for the field standby; especially since in order to arrive at bwi I will have to get up before xk:00. After speaking with the duty manager; I decided to wait till the morning to see if I was able to get quality rest. Unfortunately; I was not able to fall asleep early enough to get any significant rest. I probably got about 1.5 to 2 hours of sleep and not quality rest. When I woke up for my assignment; I felt extremely tired and not fit for duty so I called the scheduler to call in fatigue. In addition; when I checked my schedule after I woke up; the scheduler already put a trip on my schedule for xm:30 departure from bwi to [the west coast] with a deadhead afterwards. I was not in adequately rested condition to fly a 6 hour leg therefore the safer option was a fatigue call.

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Original NASA ASRS Text

Title: B737 First Officer reported fatigue event due to conflicting work-duty rest periods.

Narrative: This fatigue event was a result of scheduling a reserve pilot for an evening coverage and then resetting him to an early morning event. All of my times are in local East Coast base time. I was scheduled for XA:00 short call. After I received my assignment [the day before]; I looked at the weather forecast for the day of my short call and realized there is significant winter storm that is going to hit the mid-west. Knowing that delays in [mid-west] can affect all our operations here; I slept in longer that I normally do; and I also decided to take early afternoon nap to ensure I am ready to potentially fly an all nighter as I didn't start my short call till XA:00 and was covering the evening push. Little after XA:00; I received a call from the scheduler notifying me that I was being released from my short call to a XM:15 field standby [the following day] at our cross town airport; BWI. I explained to the scheduler that I shifted my sleep cycle and it will be extremely difficult for me to get any rest to be ready for the field standby; especially since in order to arrive at BWI I will have to get up before XK:00. After speaking with the Duty Manager; I decided to wait till the morning to see if I was able to get quality rest. Unfortunately; I was not able to fall asleep early enough to get any significant rest. I probably got about 1.5 to 2 hours of sleep and not quality rest. When I woke up for my assignment; I felt extremely tired and not fit for duty so I called the scheduler to call in fatigue. In addition; when I checked my schedule after I woke up; the scheduler already put a trip on my schedule for XM:30 departure from BWI to [the West Coast] with a deadhead afterwards. I was not in adequately rested condition to fly a 6 hour leg therefore the safer option was a fatigue call.

Data retrieved from NASA's ASRS site 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.