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The REM-NREM sleep cycle: renewal process or periodically driven process?

H Schulz, G Dirlich, S Balteskonis

    Sleep
    |January 1, 1980
    PubMed
    Summary
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    This study found that successive REM-NREM sleep cycles show serial dependence, meaning one cycle influences the next. This supports a periodically driven process model of sleep regulation.

    Area of Science:

    • Neuroscience
    • Sleep Science
    • Chronobiology

    Background:

    • Understanding the regulation of sleep-wake cycles is crucial for human health.
    • The relationship between successive rapid eye movement (REM) and non-rapid eye movement (NREM) sleep cycles is not fully understood.
    • Previous models proposed either serial dependence or a renewal process for these cycles.

    Purpose of the Study:

    • To investigate the serial dependence between consecutive REM-NREM sleep cycles.
    • To differentiate between a periodically driven process and a renewal model for sleep cycle regulation.

    Main Methods:

    • Analysis of 309 sleep episodes from 11 healthy young adults in a sleep laboratory.
    • Further analysis of 107 sleep episodes from 5 subjects in an underground isolation unit with free-running cycles.

    Related Experiment Videos

  • Computation of covariances between the first three REM-NREM cycles using an intraindividual cross-night approach.

    • Main Results:

    • Significant negative covariances were observed between successive REM-NREM sleep cycles.
    • The findings confirm the presence of serial dependencies between sleep cycles.
    • The data align with a periodically driven process model.

    Conclusions:

    • Sleep regulation exhibits serial dependence between REM-NREM cycles.
    • The results support a periodically driven process, analogous to the basic rest-activity cycle.
    • The renewal model for sleep cycle regulation is not supported by these findings.