# Sleep and cognition

Not yet reviewed by a human. 2 papers are in the library.

**Graded Strong**: Prospective cohort of 53,448 UK adults aged 60 and over followed about 8 years, with results confirmed in a second cohort of 3,965 followed roughly 11 years.

## Papers (2)

- [Your Sleep Tracker May Spot Dementia Risk Years Before Symptoms Appear](https://longevity-china.com/en/research/your-sleep-tracker-may-spot-dementia-risk-years-before-symptoms-appear) · Strong · n = 57000 · 2026 · JAMA neurology
- [Why Losing Muscle With Age May Make Bad Sleep Worse for Your Brain](https://longevity-china.com/en/research/why-losing-muscle-with-age-may-make-bad-sleep-worse-for-your-brain) · Preliminary · 2026 · Neuroscience and biobehavioral reviews

## How this map is computed

A mark's size is the number of papers we hold on that pairing. It is a count, not a weighting by study design or sample size.

The fill shows the strongest grade in the cell. One Strong paper among four Preliminary ones still fills it dark, so open the cell to see the rest.

Grades and verdicts are assigned by a named person, never by counting.

An empty cell is a finding: nobody in our library has run that trial yet.

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_Canonical: https://longevity-china.com/en/evidence/sleep/cognition · Part of Longevity Cities_