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Do sleep, stress, and illness explain daily variations in fatigue? A prospective study
Torbjörn Akerstedt1, John Axelsson2, Mats Lekander1
1Stress Research Institute, Stockholm University, Stockholm, Sweden; Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
Journal of Psychosomatic Research
|March 18, 2014
Summary
Daily fatigue levels are significantly influenced by sleep quality and duration from the previous night. Stress and illness symptoms on the same day also contribute to increased fatigue experiences.
Area of Science:
- Psychology
- Sleep Science
- Public Health
Background:
- Fatigue is a prevalent symptom impacting well-being, health service utilization, and sickness absence.
- Understanding the daily determinants of fatigue variation is crucial but underexplored in normal life settings.
Purpose of the Study:
- To investigate the daily relationships between fatigue and factors like sleep, stress, and illness symptoms.
- To examine these associations over 42 consecutive days in a general population sample.
Main Methods:
- A 42-day diary study involving 50 participants reporting daily fatigue, sleep, stress, and illness.
- Objective sleep data collected using actigraphy.
- Multilevel mixed-model regression analysis to assess relationships.
Main Results:
- Poor sleep quality and reduced sleep duration the previous night were significantly linked to increased fatigue.
- Higher daily stress levels and the presence of cold or fever symptoms were associated with greater fatigue.
- Fatigue showed strong correlations with subjective health status and sleepiness on the same day.
Conclusions:
- Sleep quality and duration are critical predictors of daily fatigue fluctuations.
- Stress and acute illness are significant contributors to the daily experience of fatigue.
- These findings highlight the interconnectedness of sleep, stress, illness, and fatigue in everyday life.
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