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Fatigue and sleep disorders

K L Lichstein1, M K Means, S L Noe

  • 1Department of Psychology, University of Memphis, TN 38152, USA.

Behaviour Research and Therapy
|August 1, 1997
PubMed
Summary
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Fatigue is a common and severe symptom in sleep disorders, independent of daytime sleepiness. This study highlights the need to address fatigue complaints in sleep medicine.

Area of Science:

  • Sleep Medicine
  • Clinical Psychology

Background:

  • Fatigue is often misdiagnosed as sleepiness, lacking independent study.
  • Understanding fatigue as a distinct symptom of sleep disturbance is crucial.

Purpose of the Study:

  • To investigate the prevalence and severity of fatigue in sleep-disordered individuals.
  • To determine if fatigue is an independent symptom from daytime sleepiness.

Main Methods:

  • Administered the Fatigue Severity Scale (FSS) to 206 patients at a sleep disorder center.
  • Analyzed correlations between fatigue scores and various clinical and sleep variables.
  • Utilized the Multiple Sleep Latency Test (MSLT) to measure daytime sleepiness.

Main Results:

  • The sample reported severe fatigue (average FSS score of 4.8).

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  • High fatigue levels were observed across various sleep disorders, especially psychophysiological insomnia.
  • Female gender, smoking, high BMI, low sleep efficiency, and high MMPI scores predicted fatigue, but daytime sleepiness did not.

    • Conclusions:

    • Daytime sleepiness and perceived fatigue appear to be independent phenomena.
    • The study emphasizes validating patient complaints of fatigue.
    • Further research is recommended on fatigue in insomnia and objective fatigue measures.