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No phenotypic or genotypic evidence for a link between sleep duration and brain atrophy

  • Anders M. Fjell*
  • , Øystein Sørensen
  • , Yunpeng Wang
  • , Inge K. Amlien
  • , William F.C. Baaré
  • , David Bartrés-Faz
  • , Lars Bertram
  • , Carl Johan Boraxbekk
  • , Andreas M. Brandmaier
  • , Ilja Demuth
  • , Christian A. Drevon
  • , Klaus P. Ebmeier
  • , Paolo Ghisletta
  • , Rogier Kievit
  • , Simone Kühn
  • , Kathrine Skak Madsen
  • , Athanasia M. Mowinckel
  • , Lars Nyberg
  • , Claire E. Sexton
  • , Cristina Solé-Padullés
  • Didac Vidal-Piñeiro, Gerd Wagner, Leiv Otto Watne, Kristine B. Walhovd
*Corresponding author for this work
  • University of Oslo
  • University of Copenhagen, Denmark
  • University of Barcelona
  • Umeå University
  • Max Planck Institute
  • Medical School Berlin
  • Charite - Universitatsmedizin Berlin
  • Vitas AS
  • University of Oslo & Vitas Ltd
  • Department of Cardiovascular Medicine
  • University of Geneva
  • Donders Institute for Brain, Cognition and Behaviour
  • University Hospital Hamburg-Eppendorf
  • Umeå Universitet
  • California State University Los Angeles
  • Alzheimer’s Association
  • Friedrich Schiller University Jena

Abstract

Short sleep is held to cause poorer brain health, but is short sleep associated with higher rates of brain structural decline? Analysing 8,153 longitudinal MRIs from 3,893 healthy adults, we found no evidence for an association between sleep duration and brain atrophy. In contrast, cross-sectional analyses (51,295 observations) showed inverse U-shaped relationships, where a duration of 6.5 (95% confidence interval, (5.7, 7.3)) hours was associated with the thickest cortex and largest volumes relative to intracranial volume. This fits converging evidence from research on mortality, health and cognition that points to roughly seven hours being associated with good health. Genome-wide association analyses suggested that genes associated with longer sleep for below-average sleepers were linked to shorter sleep for above-average sleepers. Mendelian randomization did not yield evidence for causal impacts of sleep on brain structure. The combined results challenge the notion that habitual short sleep causes brain atrophy, suggesting that normal brains promote adequate sleep duration—which is shorter than current recommendations.

Original languageEnglish
JournalNature Human Behaviour
Volume7
Issue number11
Pages (from-to)2008-2022
Number of pages15
DOIs
Publication statusPublished - 11.2023

Funding

FundersFunder number
California Walnut Commission
Knut och Alice Wallenbergs Stiftelse
Norges Idrettshøgskole
National Association for Public Health
Norges Forskningsråd
Agencia Estatal de Investigación
Horizon 2020
WU-Minn Consortium1U54MH091657
Bundesministerium für Bildung und Forschung677804, 16SV5536K, 01GL1716B, 01GL1716A, 01UW0808, 01UW0706, 16SV5538, 16SV5537, 16SV5837
Horizon 2020 Framework Programme732592
McDonnell Center for Systems Neuroscience32048
European Regional Development FundNCT01634841
Wellcome Trust203139
Ministerio de Economía y CompetitividadPSI2015-64227-R
European Research Council283634, 725025, 313440
Lifelong Health and Well-being ProgrammeG1001354
Medical Research Council203139/Z/16/Z

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 3 - Good Health and Well-being
      SDG 3 Good Health and Well-being

    Research Areas and Centers

    • Academic Focus: Center for Brain, Behavior and Metabolism (CBBM)
    • Research Area: Medical Genetics

    DFG Research Classification Scheme

    • 2.23-06 Molecular and Cellular Neurology and Neuropathology

    KDSF Research Field Classification Scheme

    • 231 - Cells and Genes

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