More REM Sleep Linked to Lower Risk of 83 Diseases, Including Dementia and Heart Failure
A large 2026 study published in PLOS Medicine found that people who had more REM sleep were less likely to develop 83 diseases during follow-up, including heart failure, dementia, Alzheimer's disease, Parkinsonism and multiple sclerosis. Researchers analysed sleep data from 95,559 UK Biobank participants using wrist-worn accelerometers and followed their health outcomes for a median of 8.9 years.