Changes in sleep dimensions, cognitive transitions, and incident dementia: a two-cohort longitudinal study

Area of Science:

• Neuroscience
• Gerontology
• Public Health

Background:

• Cognitive decline and dementia pose significant public health challenges.
• Sleep disturbances are increasingly recognized as potential modifiable risk factors for cognitive impairment.

Purpose of the Study:

• To investigate the associations between longitudinal changes in sleep dimensions and cognitive transitions.
• To examine the relationship between sleep pattern changes and the risk of incident dementia.

Main Methods:

• Utilized data from UK Biobank and China Health and Retirement Longitudinal Study.
• Analyzed longitudinal changes in eight sleep dimensions (duration, chronotype, napping, etc.).
• Employed generalized linear models, logistic regression, and Cox models to assess cognitive scores, status transitions, and dementia risk.

Main Results:

• Optimizing sleep duration (7-8 hours) and shifting to morning chronotype improved cognitive scores.
• Non-optimal sleep duration and declining sleep quality increased the risk of cognitive decline.
• Napping cessation and non-optimal sleep duration were associated with higher risks of MCI progression and all-cause dementia.

Conclusions:

• Maintaining optimal sleep duration is essential for cognitive health.
• Preserving napping habits and adopting a morning chronotype are vital for dementia prevention.
• Modifying sleep patterns represents a promising strategy for mitigating dementia risk.