REM sleep linked to lower risk of 83 diseases in large study

A large-scale study involving 95,559 participants from the UK Biobank suggests a significant link between sleep quality and the prevention of various diseases. Research published in PLOS Medicine indicates that increased REM sleep—the phase associated with vivid dreaming—is connected to a lower risk for 83 different conditions. Specifically, individuals with approximately 48 minutes more REM sleep per night showed a 46% lower risk of dementia, a 31% lower risk of Alzheimer’s, and a 26% lower risk of heart failure.

Deep sleep was also found to be associated with a reduced risk for seven specific ailments, including Type 2 diabetes, Parkinson’s, and severe depression. Regarding sleep duration, the study identified an optimal window of six to eight hours for 69 out of 86 analyzed health conditions. Sleeping fewer than five hours was linked to the highest number of adverse health findings, while sleeping more than eight hours was associated with an increased risk of depression.

General health experts emphasize that while duration is important, sleep quality and personal recovery are equally vital. Adequate sleep supports metabolic health, immune function, and cognitive processes such as memory and learning. Factors such as physical activity and consistent routines are recommended to improve sleep hygiene.