Regular Dreams Linked to Lower Risk of 83 Diseases, Study Suggests

The duration of sleep stages, particularly rapid eye movement (REM) sleep, may play a more significant role in disease risk than total sleep time, according to a recent study.

The research, led by Chinese scientists and involving over 95,000 adults in the United Kingdom, found that individuals who spent more time in REM sleep experienced lower risks for 83 different diseases. REM sleep, the stage where most dreaming occurs, typically begins about 90 minutes after falling asleep and recurs in cycles, making up approximately 20 to 25 percent of total sleep time.

Researchers utilized wrist sensors to monitor participants' sleep patterns over seven days, analyzing the duration of each sleep stage, total sleep time, periods of wakefulness during the night, and overall sleep irregularity. Participants were then followed for an average of nine years to observe the correlation between their sleep habits and health outcomes.

Participants with increased REM sleep showed a 26 percent lower risk of heart failure, a 46 percent reduced risk of dementia, and an 80 percent lower risk of Parkinson's disease. These benefits were associated with approximately 48 additional minutes spent in REM sleep per night.

Deep sleep was also found to have health advantages, with individuals experiencing more deep sleep showing a lower incidence of seven conditions, including type 2 diabetes and major depression. Conversely, irregular sleep patterns and frequent night awakenings were linked to an elevated risk of conditions such as anxiety and substance use disorders.

While the study indicated that individuals consistently sleeping between six and eight hours had the lowest overall disease risk, those sleeping less than five hours per night faced an increased risk for 37 different conditions. The findings highlight the potential health benefits of prioritizing REM sleep, often shortened by early waking due to the nature of sleep cycles.