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Related Concept Videos

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Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
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Updated: Jun 20, 2026

Association Between Sleep Quality and Cognitive Symptoms in Patients with Major Depressive Disorder
04:33

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Published on: April 26, 2024

Self-reported sleep duration and cognitive functioning in the general population.

Erkki Kronholm1, Mikael Sallinen, Timo Suutama

  • 1Department of Chronic Disease Prevention, National Institute for Health and Welfare, Turku, Finland. erkki.kronholm@thl.fi

Journal of Sleep Research
|September 8, 2009
PubMed
Summary
This summary is machine-generated.

Short or long sleep duration, tiredness, and fatigue are linked to poorer cognitive function. These sleep issues impact both self-perceived and objectively measured cognitive abilities.

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Area of Science:

  • Neuroscience
  • Sleep Medicine
  • Cognitive Psychology

Background:

  • Sleep duration is linked to health risks, with previous studies suggesting a U-shaped association.
  • The relationship between sleep duration and cognitive functioning requires further investigation.

Purpose of the Study:

  • To examine the association between self-reported sleep factors and cognitive functioning in adults.
  • To test the hypothesis of a U-shaped association between sleep duration and cognitive functioning.

Main Methods:

  • Cross-sectional study of 5177 Finnish adults aged 30+ from the Finnish Health 2000 Survey.
  • Assessed sleep factors (duration, insomnia, medication, apnoea, fatigue) via questionnaires.
  • Measured objective cognitive function (verbal fluency, memory) using the CERAD battery and subjective cognitive function via questionnaires.

Main Results:

  • Short and long sleep durations, tiredness, and fatigue were associated with decreased cognitive functioning (both objective and subjective).
  • The association between sleep factors and cognitive function was stronger for subjective assessments than objective tests.
  • These findings suggest sleep duration reflects homeostatic sleep needs and health status.

Conclusions:

  • Habitual short and long sleep durations are linked to impaired cognitive performance.
  • Sleep-related factors like fatigue significantly impact cognitive abilities, particularly self-perceived function.
  • Sleep duration and quality are crucial indicators of overall health and cognitive well-being.