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REM sleep: The kind of rest essential for a healthy brain

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Two particular phases of sleep in one's nightly routine seem to play outsize roles in cognitive health.

Two particular phases of sleep in one's nightly routine seem to play outsize roles in cognitive health.

ILLUSTRATION: GEORGETTE SMITH/NYTIMES

Mohana Ravindranath

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NEW YORK – A good night’s sleep is not just about the number of hours you log. Getting quality sleep – the kind that leaves you feeling refreshed and ready for the day – is also critical for a healthy brain.

People with disturbed sleep, like insomnia or sleep apnoea, have a higher risk of developing dementia than those with no sleep issues.

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