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Sleep after transmeridian flights.

A N Nicholson, P A Pascoe, M B Spencer

    Lancet (London, England)
    |November 22, 1986
    PubMed
    Summary
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    Jet lag disrupts sleep after trans-Atlantic flights, with eastward travel causing more persistent sleep disturbance than westward travel. Hypnotics may aid initial recovery from jet lag.

    Area of Science:

    • Chronobiology and Sleep Medicine
    • Aerospace Medicine

    Background:

    • Trans-Atlantic flights involve significant time zone shifts (5 hours), impacting circadian rhythms.
    • Understanding sleep patterns after eastward and westward travel is crucial for managing jet lag.

    Purpose of the Study:

    • To investigate the effects of westward and eastward trans-Atlantic flights on nocturnal sleep and daytime sleep latency.
    • To determine the influence of flight timing and rest period displacement on sleep quality post-flight.

    Main Methods:

    • Electroencephalography (EEG) was used to record sleep patterns.
    • Participants underwent westward and eastward flights across the North Atlantic with a 5-hour time zone shift.
    • Sleep was monitored following the flights, considering flight time and rest period adjustments.

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    Main Results:

    • Westward flights led to sleep disturbance primarily in the latter part of the first night post-flight.
    • Eastward flights resulted in more persistent and prolonged sleep disturbances compared to westward flights.
    • Both flight directions and rest period timing influenced sleep parameters.

    Conclusions:

    • Eastward travel appears to cause more significant and lasting sleep disruption than westward travel.
    • Rapidly eliminated hypnotic medications may be beneficial for short-term sleep management after both westward and eastward flights.