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<p>Pilot fatigue and sleep deprivation are increasingly recognized as critical determinants of human performance in safety-sensitive occupations, particularly in commercial aviation. Rapid expansion of aviation systems, including in emerging markets such as India, has been accompanied by intensified aircraft utilization, complex duty schedules and increased night operations, all of which heighten vulnerability to fatigue-related performance impairment. Fatigue is a physiologically grounded state arising from the interaction of sleep loss, extended wakefulness and circadian misalignment. This review synthesizes current understanding of the biological mechanisms underlying pilot fatigue, with particular emphasis on sleep architecture, circadian regulation and the operational significance of the Window of Circadian Low, a period of reduced alertness corresponding to the early morning circadian nadir. Experimental and field studies demonstrate that both acute sleep deprivation and chronic sleep restriction impair vigilance, reaction time, executive function and psychomotor coordination. Epidemiological evidence further indicates a substantial prevalence of fatigue, excessive daytime sleepiness and sleep disorders, including obstructive sleep apnoea, among commercial pilots. Contemporary aviation operations, particularly high-frequency short-haul sectors and irregular duty schedules, exacerbate circadian disruption and cumulative sleep debt. While prescriptive regulatory frameworks such as Flight Duty Time Limitations provide essential safeguards, they may not adequately capture inter-individual variability or dynamic operational demands. In contrast, Fatigue Risk Management Systems offer a data-driven, adaptive approach integrating physiological principles with operational context. By bridging advances in sleep and circadian science with aviation practice, this review identifies key gaps in fatigue mitigation and outlines strategies including circadian-informed rostering, systematic screening for sleep disorders and strengthening of fatigue reporting systems. These findings underscore the need to embed biological principles within aviation policy to enhance pilot wellbeing, operational performance and passenger safety.</p>

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Sleep Deprivation and Fatigue in Commercial Aviation: Circadian Biology, Operational Risk and Fatigue Management in Global and Indian Aviation

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Velayudhan Mohan Kumar,
  • Hruda Nanda Mallick,
  • Kamalesh K. Gulia,
  • Deepak Shrivastava,
  • Manvir Bhatia

摘要

Pilot fatigue and sleep deprivation are increasingly recognized as critical determinants of human performance in safety-sensitive occupations, particularly in commercial aviation. Rapid expansion of aviation systems, including in emerging markets such as India, has been accompanied by intensified aircraft utilization, complex duty schedules and increased night operations, all of which heighten vulnerability to fatigue-related performance impairment. Fatigue is a physiologically grounded state arising from the interaction of sleep loss, extended wakefulness and circadian misalignment. This review synthesizes current understanding of the biological mechanisms underlying pilot fatigue, with particular emphasis on sleep architecture, circadian regulation and the operational significance of the Window of Circadian Low, a period of reduced alertness corresponding to the early morning circadian nadir. Experimental and field studies demonstrate that both acute sleep deprivation and chronic sleep restriction impair vigilance, reaction time, executive function and psychomotor coordination. Epidemiological evidence further indicates a substantial prevalence of fatigue, excessive daytime sleepiness and sleep disorders, including obstructive sleep apnoea, among commercial pilots. Contemporary aviation operations, particularly high-frequency short-haul sectors and irregular duty schedules, exacerbate circadian disruption and cumulative sleep debt. While prescriptive regulatory frameworks such as Flight Duty Time Limitations provide essential safeguards, they may not adequately capture inter-individual variability or dynamic operational demands. In contrast, Fatigue Risk Management Systems offer a data-driven, adaptive approach integrating physiological principles with operational context. By bridging advances in sleep and circadian science with aviation practice, this review identifies key gaps in fatigue mitigation and outlines strategies including circadian-informed rostering, systematic screening for sleep disorders and strengthening of fatigue reporting systems. These findings underscore the need to embed biological principles within aviation policy to enhance pilot wellbeing, operational performance and passenger safety.