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Personality correlates with sleep-wake variables.

Adriane M Soehner1, Kathy S Kennedy, Timothy H Monk

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA.

Chronobiology International
|November 13, 2007
PubMed
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Personality traits like neuroticism and sub-clinical manic symptoms influence sleep timing and quality, but not sleep duration. Higher neuroticism is linked to poorer sleep quality, while manic symptoms correlate with later bedtimes and eveningness.

Area of Science:

  • Psychology
  • Sleep Science
  • Personality Research

Background:

  • Personality traits are known to influence various aspects of health and behavior.
  • Sleep is a critical physiological process affected by numerous factors, including psychological ones.
  • Previous research suggests links between personality and sleep, but specific associations require further clarification.

Purpose of the Study:

  • To investigate the relationship between specific personality traits (Extraversion, Neuroticism) and sub-clinical manic symptoms with sleep timing, quality, and duration.
  • To determine if personality characteristics predict objective or subjective measures of sleep.
  • To explore the differential impact of personality on various sleep parameters.

Main Methods:

  • A mail-in questionnaire study with 54 working adults assessed personality using the Eysenck Personality Inventory (EPI) and Attitude to Life Questionnaire (ATLQ).

Related Experiment Videos

  • Sleep quality was measured by the Pittsburgh Sleep Quality Index (PSQI), and sleep timing/duration by the Sleep Timing Questionnaire (STQ).
  • Two archival studies (n=201 and n=101) confirmed key correlational findings regarding personality and sleep.

    • Main Results:

    • Increased sub-clinical manic symptoms were significantly associated with later work-week bedtimes and wake-times, and a more evening-type preference (lower Composite Scale of Morningness scores).
    • Higher neuroticism scores were significantly correlated with poorer sleep quality, as indicated by higher PSQI scores.
    • No significant correlations were found between any personality variables and any measures of sleep duration.

    Conclusions:

    • Personality traits, specifically neuroticism and sub-clinical manic symptoms, significantly impact certain aspects of sleep timing and subjective sleep quality.
    • These personality factors do not appear to influence the overall duration of sleep.
    • The findings highlight a nuanced relationship between personality and sleep, affecting timing and quality more than quantity.