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Clinical Manifestations.

Jun Ha Chang1, Melissa Hatch1, Karla Lynch1

  • 1University of Nebraska Medical Center, Omaha, NE, USA.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 24, 2025
PubMed
Summary
This summary is machine-generated.

Shorter sleep duration before cognitive tests increases the likelihood of mild cognitive impairment (MCI) reversion. Acute sleep variations should be considered in MCI diagnosis and management for better cognitive health outcomes.

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Area of Science:

  • Gerontology
  • Neuroscience
  • Sleep Medicine

Background:

  • Mild cognitive impairment (MCI) diagnosis can be transient, with 15-48% reverting to normal cognition.
  • Sleep disruption is prevalent in older adults and can temporarily impair cognitive function.
  • Hypothesis: Greater sleep disruption before cognitive assessments is linked to increased MCI reversion.

Purpose of the Study:

  • To investigate the association between sleep disruption and MCI reversion.
  • To determine if objective sleep measures predict cognitive status changes over one year.

Main Methods:

  • Sixty older adults (mean age 75) with MCI underwent cognitive assessments.
  • Objective sleep data (duration, efficiency) collected via actigraphy and sleep diaries.
  • Logistic regression analyzed the odds of MCI reversion at one-year follow-up, adjusting for age and gender.

Main Results:

  • 25% of participants reverted to normal cognitive status after one year.
  • Shorter sleep duration the night before baseline assessment significantly predicted higher odds of reversion (p=0.049).
  • Each SD increase in sleep duration reduced reversion odds by ~53%; sleep efficiency was not significant.

Conclusions:

  • Shorter sleep preceding cognitive evaluation is associated with a higher likelihood of MCI reversion.
  • Acute sleep variations warrant consideration in MCI diagnosis to differentiate from progressive conditions.
  • Integrating sleep measures may refine diagnostic accuracy and guide interventions for cognitive health.