![]() ![]() In a pilot, fatigue may manifest itself by: Hazardsįatigue usually results in impaired standards of operation with increased likeliness of error. by having an hour less of sleep for several consecutive days needs a series of days with more-than-usual sleep for a person to fully recover from cumulative fatigue. Researches show that the accumulation of "sleep debt", e.g. Circadian fatigue refers to the reduced performance during nighttime hours, particularly during an individual’s “window of circadian low” (WOCL) (typically between 2:00 a.m.Cumulative fatigue is fatigue brought on by repeated mild sleep restriction or extended hours awake across a series of days.Transient fatigue is acute fatigue brought on by extreme sleep restriction or extended hours awake within 1 or 2 days.There are three types of fatigue: transient, cumulative, and circadian: They are often sleepier than they report. ![]() It is important to note that people are not the best evaluators of their own alertness state. Shift patterns and transit across time zones can interrupt circadian rhythms so that, for example, it may be difficult for flight crew or pilots on duty in the early hours of the morning or flight crew operating long-haul routes through multiple time zones to achieve satisfactory rest prior to commencing duty. Sleep patterns are naturally associated with the body's circadian rhythms. Mental fatigue often results from loss or interruption of the normal sleep pattern and is therefore of great concern to pilots and ATCOs, who are frequently required to work early in the morning or at night. Mental fatigue, which may include sleepiness, concerns a general decrease of attention and ability to perform complex, or even quite simple tasks with customary efficiency. Physical fatigue often leads to mental fatigue. Physical fatigue most commonly results from physical exercise or loss of sleep. It may be an overall tiredness of the whole body, or be confined to particular muscle groups. Physical fatigue concerns the inability to exert force with ones muscles to the degree that would be expected. Fatigue is the general term used to describe physical and/or mental weariness which extends beyond normal tiredness. ![]()
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