Research found that individuals with lower proportions of time spent in slow wave sleep and rapid eye movement sleep had smaller volumes in critical brain regions, particularly the inferior parietal region, which is known to undergo early structural changes in Alzheimer's disease.

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3. Research found that individuals with lower proportions of time spent in slow wave sleep and rapid eye movement sleep had smaller volumes in critical brain regions, particularly the inferior parietal region, which is known to undergo early structural changes in Alzheimer's disease.