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Related Experiment Videos

Left sidedness and sleep difficulty: the alinormal syndrome.

S Coren, A Searleman

    Brain and Cognition
    |April 1, 1987
    PubMed
    Summary

    Individuals with left-sided dominance across multiple traits, including handedness, footedness, eyedness, and earedness, reported higher instances of sleep difficulties. This suggests a potential link between non-right-sidedness and sleep disturbances, possibly indicating broader behavioral variations.

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    Area of Science:

    • Neuroscience
    • Sleep Medicine
    • Human Behavior

    Background:

    • Laterality, encompassing handedness, footedness, eyedness, and earedness, is a fundamental aspect of human neurobiology.
    • Previous research has explored the relationship between specific aspects of laterality and various behavioral and cognitive traits.
    • Sleep difficulties are a common concern with significant implications for overall health and well-being.

    Purpose of the Study:

    • To investigate the association between multiple indicators of laterality and self-reported sleep difficulties.
    • To determine if individuals with left-sided dominance experience sleep problems more frequently than right-sided individuals.
    • To explore the potential for a syndrome of behavioral deviations linked to non-right-sidedness.

    Main Methods:

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    • Assessed four indexes of laterality: handedness, footedness, eyedness, and earedness.
    • Collected self-reported sleep data from 1274 subjects, focusing on trouble falling asleep and frequent night wakenings.
    • Compared sleep difficulty incidence between left-sided and right-sided groups based on laterality indexes.

    Main Results:

    • A higher incidence of sleep difficulty was observed in subjects identified as left-sided across the assessed laterality measures.
    • Left-sided groups reported increased trouble falling asleep and more frequent night wakenings compared to right-sided groups.
    • The findings suggest a correlation between non-right-sidedness and elevated sleep disturbances.

    Conclusions:

    • Laterality, particularly left-sidedness, may be associated with an increased risk of sleep difficulties.
    • The results support the concept of a potential 'alinormal syndrome,' characterized by behavioral deviations from the statistical norm in non-right-handed individuals.
    • Further research is warranted to elucidate the neurobiological mechanisms underlying the link between laterality and sleep patterns.