Habitual sleep length and cognitive functioning

Short sleep is typical of the professional drivers due to, for example, irregular working hours and sleep disturbances. This study investigates the relationship between self-reported sleep factors and cognitive functioning in 5177 people aged 30 years or older from a cross-sectional representative sample of the adult population in Finland (The Finnish Health 2000 Survey). Previous studies have indicated a U-shaped association between increased health risks and sleep duration; we hypothesized a U-shaped association between sleep duration and cognitive functioning.


01/200412/2012. Project ended.

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Department of Chronic Disease Prevention, National Institute for Health and Welfare; Brain Work Research Center, Finnish Institute of Occupational Health; Agora Center and Department of Psychology, University of Jyväskylä; Department of Geriatrics, School of Public Health and Clinical Nutrition, University of Kuopio; Department of Health Sciences, Finnish Centre for Interdisciplinary Gerontology, University of Jyvaskyla; Department of Mental Health and Substance Abuse Services Unit, National Institute for Health and Welfare, Helsinki, Finland

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Objective cognitive functioning was assessed with tasks derived from the Consortium to Establish a Registry for Alzheimer's Disease test battery (verbal fluency, encoding and retaining verbal material) and reaction time tasks. Subjective cognitive functioning and sleep-related factors were assessed with questionnaires. Health status was assessed during a health interview. Depressive and alcohol use disorders were assessed with the Composite International Diagnostic Interview. Medication was recorded during the health examination.

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