Greater REM sleep was linked to 80% lower Parkinson's risk and 46% lower dementia risk in a major study of over 95,000 adults tracked for years.
https://www.foxnews.com/health/sleep-type-linked-dramatically-lower-risk-dementia-parkinsons-81-diseases
https://www.foxnews.com/health/sleep-type-linked-dramatically-lower-risk-dementia-parkinsons-81-diseases