A study published in PLOS Medicine links increased REM sleep to a lower risk of 83 diseases, analyzing data from 95,559 UK participants using wrist accelerometers. The research highlights that 6–8 hours of sleep per night aligns with optimal disease risk reduction.
A large-scale study published in PLOS Medicine has found that higher amounts of REM (rapid eye movement) sleep are associated with a reduced risk of 83 diseases, including heart failure, Alzheimer’s, and diabetes. The research, which tracked 95,559 adults in the UK Biobank for nearly nine years, used wrist-worn accelerometers to measure sleep stages, offering more precise data than self-reported sleep duration.
Methodology and Key Findings
Participants wore accelerometers for one week to assess sleep duration, REM sleep, deep sleep, and sleep irregularity. Over a median follow-up of 8.9 years, researchers linked sleep patterns to health outcomes. The study found that greater REM sleep was associated with lower risks of 83 diseases, while deeper sleep reduced risks of seven conditions. Conversely, higher wakefulness after sleep onset (WASO) was tied to increased risks of six diseases.
We found that variations in sleep patterns were associated with 156 incidences of diseases,
the researchers wrote, noting that higher amounts of REM sleep and deep sleep were associated with lower risks of 83 and 7 diseases, respectively.
The study also emphasized that sleep architecture—how sleep is structured—plays a critical role in disease risk, not just total sleep duration.
The Role of Sleep Architecture
The research underscores that sleep is not just about quantity but also quality. REM sleep, characterized by vivid dreaming and brain activity similar to wakefulness, was strongly linked to reduced risks of cardiovascular and neurological conditions. Deep sleep, which aids in physical restoration, showed associations with lower risks of type 2 diabetes and Parkinson’s disease.
These findings highlight that both sleep architecture and sleep duration are associated with disease risk,
the study concluded.
Optimal Sleep Duration and Practical Advice
The study identified 6–8 hours of sleep as a “sweet spot” for minimizing disease risk. Participants sleeping less than five hours faced a higher risk of 37 diseases compared to those meeting this target.
Limitations and Unanswered Questions
While the study provides robust evidence, it does not establish causation. The researchers acknowledged that some associations might stem from reverse causation,
such as depression causing sleep disruption rather than the other way around.
Experts caution that further research is needed to understand how REM sleep interacts with biological pathways. This framework enables the identification of distinct patterns of association across multiple health domains,
the study noted, suggesting future studies could refine sleep-based health interventions.
What This Means for Public Health
The findings reinforce the importance of sleep as a public health priority. By highlighting specific sleep metrics—such as REM duration and sleep regularity—researchers provide actionable insights for individuals and policymakers. The study’s emphasis on real-world data, rather than self-reports, strengthens its credibility and practical relevance.
As sleep disorders become increasingly prevalent, these results could inform strategies to improve sleep hygiene. However, the study’s authors stress that more work is needed to disentangle the complex relationships between sleep, biology, and disease risk.