Deep sleep could be key to forestalling slow declines in brain health that may one day lead to Alzheimer's disease, the most common form of dementia.
Even so, levels of amyloid-beta proteins are commonly used as a marker of Alzheimer's disease, as research suggests they – and– can start clogging up brain cells decades before symptoms of the disease arise.
Among those whose brain scans revealed similarly high levels of beta-amyloid deposits, getting a good night's sleep seemed to make a critical difference in cognitive function. This effect was only seen when the researchers looked specifically at non-rapid eye movement slow wave sleep, and not at other sleep wave frequencies or sleep stages.
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