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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
Summary
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.
- 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.