The duration, pattern, and quality of sleep have a significant impact on the likelihood of developing various serious illnesses. This conclusion was reached by researchers who analyzed objective data on the nighttime rest of more than 95,000 people. They found that sufficient duration of key sleep phases can substantially reduce the risk of cardiovascular diseases, dementia, and severe mental disorders.

Research Methods

Previously, most studies on sleep and health relied on subjective surveys and self-reports from participants, which often led to considerable inaccuracies, as people are not always able to accurately assess the quality and duration of individual sleep phases. To obtain more precise data, a team of scientists from Beijing used the extensive dataset of the UK Biobank. The study involved 95,559 participants who wore special fitness trackers and accelerometers on their wrists for seven days. A deep learning algorithm was used to process the continuous stream of signals, allowing for highly accurate identification of sleep phases (REM, deep slow-wave sleep, light sleep), as well as recording periods of nighttime awakenings and overall sleep pattern instability.

Main Results

After collecting the data, participants' health was monitored for an average of nine years. Access to medical records made it possible to compare sleep characteristics with the risks of developing over a thousand different diseases. As a result, 156 significant associations were identified between sleep structure and disease incidence.

The analysis showed that people with the highest proportion of rapid eye movement (REM) sleep were more resilient to 83 diseases. This phase, during which emotional processing of information occurs, proved especially important for protecting the nervous and cardiovascular systems. Increasing the average duration of REM sleep by 47.6 minutes reduced the risk of heart failure by 26%, dementia by 46%, and Parkinson's disease by 80%.

Deep slow-wave sleep demonstrated a specific protective role for other body systems. Sufficient duration of this phase was linked to a lower risk of developing seven serious conditions, including type 2 diabetes and clinical depression. At the same time, frequent nighttime awakenings and an unstable sleep schedule increased vulnerability to mental disorders, particularly anxiety and addictions.

Conclusions

This study was observational and does not prove a direct causal relationship, as sleep disturbances can be an early symptom of developing diseases. Nevertheless, proper distribution of sleep phases and regular nighttime rest lasting six to eight hours are considered accessible and effective tools for disease prevention in adulthood.