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Experimental sleep fragmentation in normal subjects.

E Stepanski, J Lamphere, T Roehrs

    The International Journal of Neuroscience
    |April 1, 1987
    PubMed
    Summary
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    Sleep fragmentation, even without sleep loss, causes daytime sleepiness. This study found fragmented sleep significantly impacts sleep latency, but arousal schedules didn't alter outcomes.

    Area of Science:

    • Neurology
    • Sleep Medicine
    • Experimental Psychology

    Background:

    • Sleep fragmentation is increasingly recognized as a cause of excessive daytime sleepiness.
    • This is particularly relevant in clinical populations such as those with sleep apnea syndrome or periodic leg movements.
    • However, the precise relationship between sleep fragmentation and daytime sleepiness requires further experimental clarification.

    Purpose of the Study:

    • To experimentally investigate the impact of sleep fragmentation on daytime sleepiness.
    • To determine the relationship between the number and rate of sleep arousals and excessive daytime sleepiness.
    • To assess how different arousal schedules affect sleep latency and arousal thresholds.

    Main Methods:

    • Five male subjects underwent three consecutive nights of polysomnography (one baseline, two experimental).

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  • Experimental conditions involved three different schedules of induced sleep arousals via auditory stimuli.
  • Nocturnal polysomnograms were followed by daytime Multiple Sleep Latency Tests (MSLT).

    • Main Results:

    • Statistically significant changes in daytime sleepiness (MSLT) were observed after two nights of fragmented sleep.
    • No significant differences in MSLT outcomes were found between the three different arousal schedules.
    • Arousal thresholds demonstrated significant changes between the first and second nights of fragmented sleep.

    Conclusions:

    • Sleep fragmentation, independent of total sleep time, significantly contributes to excessive daytime sleepiness.
    • While fragmentation impacts sleepiness, the specific schedules of arousals tested did not yield differential effects.
    • Sleep fragmentation alters arousal thresholds, indicating a physiological adaptation to disrupted sleep.