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Insomnia and daytime functioning.

Brant W. Riedel1, Kenneth L. Lichstein

  • 1The University of Memphis and Methodist Healthcare of Memphis, USA

Sleep Medicine Reviews
|January 18, 2003
PubMed
Summary
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Daytime functioning deficits are not linked to insomnia. While individuals with insomnia report fatigue, objective measures show no impairment, suggesting other factors cause these daytime symptoms.

Area of Science:

  • Sleep Medicine
  • Psychology

Background:

  • Insomnia is commonly associated with daytime functioning deficits.
  • This assumption has guided clinical practice and research for decades.

Purpose of the Study:

  • To critically review the evidence linking insomnia to daytime functioning deficits.
  • To explore alternative explanations for self-reported daytime symptoms in individuals with insomnia.

Main Methods:

  • Systematic review of existing literature.
  • Analysis of studies employing objective and subjective measures of daytime functioning.
  • Examination of factors contributing to perceived daytime impairment.

Main Results:

  • Objective measures of daytime sleepiness and cognitive/psychomotor performance do not reveal deficits in individuals with insomnia.

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  • Subjective reports from individuals with insomnia frequently include fatigue, mood disturbance, and reduced quality of life.
  • Objective and subjective measures generally align, indicating a lack of objective daytime impairment.
  • Evidence suggests physiological arousal, psychological factors, or misperception of sleep need may explain reported daytime difficulties.

    • Conclusions:

    • The assumption that insomnia directly causes daytime functioning deficits is challenged by current evidence.
    • Self-reported daytime symptoms in insomnia may stem from factors independent of sleep quality.
    • Further research should investigate these alternative etiological factors.