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Flight crew sleep during multiple layover polar flights

M Sasaki1, Y S Kurosaki, C L Spinweber

  • 1Flight Crew Medical Service Dept., Japan Airlines, Tokyo.

Aviation, Space, and Environmental Medicine
|July 1, 1993
PubMed
Summary
This summary is machine-generated.

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Airline pilots experience disrupted sleep and cumulative sleep loss after multiple transmeridian flights. Even after returning home, sleep quality remains impaired, requiring at least three recovery nights before resuming duty.

Area of Science:

  • Sleep Science
  • Aviation Physiology
  • Chronobiology

Background:

  • Transmeridian flights disrupt circadian rhythms and sleep patterns.
  • Airline pilots frequently undertake long-haul flights with multiple time zone changes.
  • Understanding sleep disruption is crucial for aviation safety and crew well-being.

Purpose of the Study:

  • To investigate sleep changes in airline pilots after multiple transmeridian flights on a polar route.
  • To assess the duration and impact of sleep disruption during layovers and recovery periods.
  • To determine the cumulative sleep loss associated with multi-leg polar flights.

Main Methods:

  • 12 B747 airline pilots on a Tokyo-Anchorage-London-Anchorage-Tokyo route participated.
  • Sleep polysomnograms were recorded during baseline, layovers, and two recovery nights.

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  • Sleep parameters including total sleep time and sleep efficiency were analyzed.

    • Main Results:

    • Reduced total sleep time and low sleep efficiency (72.0%) were observed in Anchorage (outbound).
    • Sleep efficiency remained reduced in London despite increased time in bed.
    • A slow wave sleep rebound and multiple awakenings occurred on return to Anchorage, with reduced sleep efficiency (76.8%).
    • Sleep efficiency on the second recovery night was significantly lower than baseline, indicating persistent disruption.

    Conclusions:

    • Sleep is significantly disrupted for aircrews during layovers on multi-leg transmeridian flights.
    • Sleep disruption effects persist into the recovery nights, leading to cumulative sleep loss.
    • A minimum of three recovery sleep nights in the home time zone is recommended before pilots return to duty.