How REM Sleep Protects the Body
In a 2026 study published in PLOS Medicine, researchers from Capital Medical University and collaborators discovered that REM sleep is associated with a reduced risk of 83 distinct diseases. The analysis used data from over 120,000 participants followed for more than a decade across multiple countries.
The team examined self‑reported sleep stages and verified them with wearable devices. They adjusted for age, sex, body weight, and lifestyle factors, ensuring that the observed association was not driven by confounding variables. The findings suggest that the amount of REM sleep people get each night may be a key indicator of long‑term health.
REM sleep is the phase when the brain is most active, and the body is temporarily paralyzed. Scientists believe it helps the brain reorganize memories, regulate emotions, and reset metabolic pathways. During REM, the body releases growth hormone and balances stress hormones, which can reduce inflammation. Lower inflammation levels are linked to a decreased likelihood of chronic conditions such as heart disease, diabetes, and certain cancers. The study also found that those with more REM sleep had stronger immune responses, further lowering disease risk.
Could Sleep Patterns Guide Prevention?
Could doctors use REM sleep data to tailor health advice? The researchers suggest that monitoring sleep stages could become part of routine health assessments. If a patient consistently has low REM percentages, clinicians might recommend interventions that improve sleep quality, such as cognitive‑behavioral therapy or lifestyle changes. However, more research is needed to determine the best ways to increase REM sleep safely and effectively.
The study’s authors caution that correlation does not prove causation. Still, the evidence points to REM sleep as a promising target for public health initiatives. If future trials confirm these results, sleep hygiene could become as important as diet and exercise in preventing disease.
Frequently Asked Questions
What is REM sleep? Rapid Eye Movement sleep is the stage where the brain is highly active, dreams occur, and the body temporarily loses muscle tone. It usually makes up about 20–25 % of total sleep time.
How many diseases are linked to REM sleep? The study identified 83 diseases with a statistically significant lower risk among those who experienced more REM sleep.
Can I increase my REM sleep? Good sleep hygiene—consistent bedtime, a dark room, and reducing caffeine—can help. If you suspect a sleep disorder, consult a healthcare professional for personalized advice.