Study Links Poor Sleep to Increased Risk of 83 Diseases

The findings suggest that individuals who enjoy longer periods of rapid eye movement (REM) sleep face a significantly lower risk of 83 diseases, including dementia, heart failure, and Parkinson’s disease. The study emphasized the importance of REM sleep, a crucial phase associated with dreaming and essential for memory, learning, and emotional health.

Researchers evaluated 95,559 adults from the UK Biobank, utilizing wrist devices over a week to record their movement and sleep patterns. A deep-learning computer system measured the participants' time spent in REM, deep, and light sleep, alongside total sleep duration and irregularities in sleep patterns.

Participants were observed for a median duration of 8.9 years, during which the researchers identified over 1,000 diseases that emerged. An increase of approximately 48 minutes in REM sleep correlated with a reduced risk of 83 health conditions. Notably, the risk of heart failure decreased by 26 percent, while the risk of dementia dropped by about 46 percent.

Deep sleep was also linked to a lower risk of several conditions, including type 2 diabetes and major depressive disorder. The results highlighted that different sleep stages serve distinct functions in maintaining good health, and sleep irregularity could elevate the risk of various health issues, including anxiety and substance use disorders.

Furthermore, spending excessive time awake after initially falling asleep was associated with a higher disease risk, indicating that sufficient duration in bed does not negate health problems caused by frequent interruptions.

The relationship between total sleep duration and disease risk was found to be non-linear, with the lowest risk observed in individuals sleeping between six and eight hours per night. Sleeping less than five hours correlated with an increased risk of 37 conditions.

The study reinforces the importance of healthy sleep habits for disease prevention, particularly in middle-aged and older adults, suggesting that lasting benefits accrue from consistently getting between six and eight hours of sleep.

While the reliance on objective measurements from wearable devices enhances the reliability of the findings, the research does not establish a direct causation between increased REM or deep sleep and disease prevention. As an observational study, it acknowledges that various factors such as age, lifestyle, and pre-existing health conditions could influence the outcomes.

Overall, the study underscores that quality sleep, regular sleep schedules, and sufficient total sleep time are essential for long-term health.