Study Links Poor Sleep to Increased Risk of 83 Diseases

The study found that individuals who spent more time in rapid eye movement (REM) sleep had a lower risk of developing 83 diseases, including dementia, heart failure, and Parkinson’s disease. REM sleep is crucial for memory, learning, and emotional health, while deep sleep is vital for bodily recovery and repair.

Researchers analyzed data from 95,559 adults from the UK Biobank, using wrist devices to track movement and sleep patterns for seven days and nights. A deep-learning computer system estimated the time spent in REM, deep, and light sleep, along with total sleep time and sleep pattern variations.

During a follow-up period averaging 8.9 years, health records revealed over 1,000 diseases and health conditions. An increase of approximately 48 minutes in REM sleep correlated with significantly reduced disease risk, showing a 26% lower risk for heart failure, a 46% lower risk for dementia, and an even stronger link for Parkinson’s disease.

Additionally, more time spent in deep sleep was associated with a reduced risk of seven conditions, such as type 2 diabetes and major depressive disorder. The findings suggest that different sleep stages serve distinct health functions, challenging the notion that sleep is merely a time of rest.

The study also highlighted that frequent changes in sleep schedules correlated with higher risks of multiple health issues, including anxiety and substance use disorders. Participants who frequently awoke after falling asleep faced increased health risks, indicating that consistent interruptions can affect health despite sufficient time spent in bed.

Total sleep duration proved important as well, showing complex relationships with health risks. The lowest risk for many conditions was observed in those who slept between six and eight hours nightly. Sleeping less than five hours increased risk for 37 conditions, underscoring the potential long-term health consequences of chronic sleep deprivation.

The researchers emphasized the importance of maintaining a regular sleep routine for disease prevention, particularly in middle-aged and older adults. The study's reliance on wearables provided more accurate data on sleep patterns than self-reported information often used in similar studies.

While the findings do not establish a direct cause-and-effect relationship between sleep quality and disease prevention, they contribute to the understanding that healthy sleep involves not only getting enough hours in bed but also ensuring the quality and regularity of sleep patterns.