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Story summary
- Chinese researchers found greater REM sleep reduces risk for 83 diseases, including Parkinson’s, dementia, heart failure.
- REM sleep cut Parkinson’s risk by 80%, dementia by 46% and heart failure by 26%.
- Deep sleep linked to lower risk of seven conditions, notably Type 2 diabetes and major depressive disorder.
- Six to eight nightly hours gave the lowest risk for 69 diseases, while under five hours raised risk for 37.