# Your Sleep Tracker May Spot Dementia Risk Years Before Symptoms Appear

*Digital Sleep-Wake Cycle Metrics and Dementia Prediction in Older Adults.*

- **Evidence Level**: Strong
- **Publication Types**: Journal Article
- **Journal**: JAMA neurology
- **Sample Size**: 57,000+ adults aged 60+
- **Authors**: Cavaillès C, Danilevicz IM, Vidil S, Fayosse A, Chen M, van Hees V, Kivimäki M, Dugravot A, Singh-Manoux A, Sabia S
- **Published**: 2026-05-18
- **Topics**: dementia, sleep, wearables
- **DOI**: https://doi.org/10.1001/jamaneurol.2026.1232
- **Original Source**: https://pubmed.ncbi.nlm.nih.gov/42149581/

## Summary

Researchers tracked older adults' sleep and movement patterns using wrist accelerometers, then watched who developed dementia. Less daytime activity and disrupted sleep both predicted higher dementia risk years later. Adding these movement patterns to standard risk models boosted prediction as much as testing for the APOE gene, a known dementia risk factor.

## Practical Takeaway

This study suggests tracking daily activity and sleep patterns may flag early dementia risk.

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_Canonical: https://usa-longevity.com/en/research/your-sleep-tracker-may-spot-dementia-risk-years-before-symptoms-appear · Part of Longevity Cities · Updated 2026-05-18_