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Related Experiment Video

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Alzheimer's Imaging Consortium.

Bery Mohammediyan1,2, Sylvia Villeneuve3,4,5, Béatriz Oliveira6,7

  • 1Center for advanced research in sleep medicine, Research Center of the CIUSSS-NIM, Montreal, QC, Canada.

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Summary

Insomnia symptoms in older adults at high risk for Alzheimer's disease were surprisingly linked to better memory and attention. This suggests sleep disturbances might indicate underlying protective factors influencing cognition.

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Area of Science:

  • Neuroscience
  • Gerontology
  • Sleep Medicine

Background:

  • Investigated the relationship between insomnia and cognitive changes over time.
  • Focused on older adults at elevated risk for Alzheimer's disease (AD).

Purpose of the Study:

  • To determine if insomnia is associated with cognitive changes in a high-risk population.
  • To explore the link between self-reported and objectively measured insomnia and cognition.

Main Methods:

  • Studied 348 dementia-free older adults with a family history of AD.
  • Assessed insomnia using the Pittsburgh Sleep Quality Index (PSQI) and 7-day actigraphy.
  • Measured cognition (memory, attention) annually for over 7 years using RBANS.

Main Results:

  • More self-reported insomnia symptoms correlated with higher baseline immediate and delayed memory.
  • Objective insomnia measures from actigraphy showed higher longitudinal delayed memory.
  • Individuals with only objectively measured insomnia had the best longitudinal delayed memory scores.

Conclusions:

  • Contrary to expectations, increased insomnia symptoms were associated with better cognitive function in this AD risk group.
  • This association may be explained by protective lifestyle factors that enhance cognition but disrupt sleep.