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Sleep at altitude

J C Miller, S M Horvath

    Aviation, Space, and Environmental Medicine
    |July 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Hypobaric hypoxia at 3500m caused sleep disturbances, particularly insomnia, in subjects with acute mountain sickness (AMS). Despite this, synchronized sleep levels remained relatively normal, suggesting potential sleep hypoventilation at altitude.

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    Area of Science:

    • Altitude Physiology
    • Sleep Medicine
    • Environmental Health

    Background:

    • Hypobaric hypoxia, simulating high altitudes, significantly impacts physiological functions.
    • Sleep quality is crucial for adaptation and performance at extreme environments.
    • Acute mountain sickness (AMS) is a common condition affecting individuals ascending to high altitudes.

    Purpose of the Study:

    • To investigate the effects of hypobaric hypoxia on sleep patterns.
    • To assess the relationship between acute mountain sickness severity and sleep disturbance.
    • To evaluate sleep electrophysiology at simulated high altitude.

    Main Methods:

    • Eight healthy adults (4 male, 4 female, 18-29 years) underwent polysomnography.
    • Sleep was recorded for two consecutive nights in a hypobaric chamber at 493 torr (3500 m).

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  • Subjects were monitored for symptoms of acute mountain sickness (AMS).

    • Main Results:

    • Sleep disturbance, characterized by insomnia, was reported by two subjects with higher AMS severity.
    • Despite subjective complaints, relatively normal amounts of synchronized sleep were observed at 493 torr.
    • Findings suggest potential sleep hypoventilation during exposure to hypobaric hypoxia.

    Conclusions:

    • Hypobaric hypoxia can lead to sleep disturbances, especially when accompanied by AMS.
    • Synchronized sleep may be preserved at simulated high altitude, but with possible hypoventilation.
    • Further research is needed to understand the mechanisms of sleep disruption and hypoventilation at altitude.