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Alzheimer's Imaging Consortium.

Dillys Xiaodi Liu1, Clémence Cavaillès1, Meredith N Braskie2

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Summary
This summary is machine-generated.

Longer sleep durations (>8 hours) and poor sleep quality are linked to brain changes associated with Alzheimer's Disease (AD). These findings highlight the importance of sleep for brain health in older adults.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Sleep Medicine

Background:

  • Poor sleep is a known risk factor for Alzheimer's Disease (AD).
  • The precise relationship between objective sleep patterns and AD biomarkers remains unclear.
  • This study investigates sleep characteristics and AD-related MRI biomarkers in diverse older adults.

Purpose of the Study:

  • To examine associations between objective sleep metrics and AD-related MRI biomarkers.
  • To understand how sleep duration, efficiency, and disturbances relate to brain changes in aging.
  • To explore these relationships in a diverse cohort of community-dwelling older adults.

Main Methods:

  • Utilized wrist actigraphy for objective sleep assessment (duration, TIB, SE, WASO, etc.).
  • Measured AD-related MRI biomarkers: hippocampal volume, cortical thickness, and white matter hyperintensity (WMH) volume.
  • Employed multivariable linear regressions, adjusting for demographic, lifestyle, and clinical factors.

Main Results:

  • Nighttime sleep duration over 8 hours was associated with smaller hippocampal volume and thinner AD-signature cortex.
  • Increased wake after sleep onset (WASO) and longer awakening length correlated with reduced hippocampal volume.
  • No significant associations were found between sleep characteristics and white matter hyperintensity (WMH) volume.

Conclusions:

  • Longer sleep duration (>8 hours) and poorer sleep quality (longer TIB, WASO, awakening length) are linked to adverse AD-related MRI patterns.
  • These findings suggest sleep disturbances may contribute to AD pathology in older adults.
  • Further longitudinal research is needed to elucidate the underlying pathophysiological mechanisms.