Sleep plays a crucial role in clearing toxic waste such as proteins linked to Alzheimer’s disease from the brain, and smartwatch data could help warn of problems, according to a new scientific review.
The cerebral cleaning’s rhythms appear to parallel tiny changes in intervals between heartbeats that can be measured by a wearable wrist device, says the paper published in Science on Thursday.
The study is part of a growing effort to identify the purpose of sleep, and health risks resulting from a lack of it. It found that slumber is needed for essential biological purging — suggesting that skipping it may carry greater risks than feeling below par at work or socially.
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