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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.
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.

