Mixed
Poor sleep quality is associated with increased longitudinal cortical atrophy in community-dwelling adults, particularly those over the age of 60.
Prioritize sleep quality as a critical component of brain health, especially as you age. Poor sleep is linked to brain shrinkage (atrophy) in key areas. Focus on improving sleep efficiency (time asleep vs. time in bed) rather than just duration. If you are over 60, this link is even stronger. Consult a sleep specialist if you have chronic sleep issues.
Poor sleep quality was associated with reduced volume within the right superior frontal cortex in cross-sectional analyses, and an increased rate of atrophy within widespread frontal, temporal, and parietal regions in longitudinal analyses.
Why this rating
Longitudinal MRI study with a moderate sample size (n=147), controlling for key confounders (BMI, BP, physical activity), but relying on self-reported sleep quality (PSQI).
Source
Poor sleep quality is associated with increased cortical atrophy in community-dwelling adults
Claire E. Sexton et al. · Neurology · 2014
DOI 10.1212/wnl.0000000000000774
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