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Chronic insomnia and performance in a 24-h constant routine study
Michael Varkevisser1, Gerard A Kerkhof
1Department of Psychology, University of Amsterdam, The Netherlands. m.varkevisser@uva.nl
Journal of Sleep Research
|March 4, 2005
Summary
Chronic insomnia significantly impairs daily functioning, affecting vigilance, memory, and motor control. Performance deficits persist across the 24-hour cycle, independent of circadian rhythms.
Area of Science:
- Neuroscience
- Sleep Medicine
- Chronobiology
Background:
- Insomnia is often associated with self-reported daytime impairment, yet objective neurobehavioral deficits are not consistently found.
- The impact of circadian rhythms on the performance of individuals with chronic insomnia remains poorly understood.
Purpose of the Study:
- To investigate performance deficits in chronic insomnia under controlled conditions.
- To examine the influence of circadian rhythmicity on the functioning of insomniacs.
Main Methods:
- A 24-hour constant routine study was conducted.
- Assessed psychomotor performance, body temperature, and subjective functioning in 11 insomniacs and 13 healthy controls.
Main Results:
- Insomniacs exhibited significant impairments in vigilance, working memory, and motor control.
- Circadian patterns for body temperature, performance, and subjective functioning were similar in both groups.
- Insomniacs reported increased fatigue, sleepiness, mood disturbances, and concentration problems.
Conclusions:
- Chronic insomnia is linked to a substantial, sustained reduction in 24-hour performance and subjective functioning.
- These deficits occur irrespective of task type or circadian rhythm phase.
- Chronic insomnia negatively impacts performance even under strictly controlled, unmasked laboratory conditions.