What are the causes of fatigue for pilots? What are the dangers of fatigue? M What phase(s) of flight is fatigue most an issue? Least an issue?

Fatigue is particularly prevalent among pilots because of "unpredictable work hours, long duty periods, circadian disruption, and insufficient sleep". These factors can occur together to produce a combination of sleep deprivation, circadian rhythm effects, and 'time-on task' fatigue.

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