Study Links Sleeping Less Than Five Hours to 37 Diseases
Sleeping less than five hours a night is linked to an elevated risk of developing 37 distinct health conditions, according to a large observational study published in PLOS Medicine on September 17, 2026. The research tracked 95,559 adult participants from the UK Biobank over an average of nearly nine years to examine how long-term health outcomes connect to sleep patterns.
arabic.euronews.com reported that researchers utilized wrist-worn accelerometers and deep-learning artificial intelligence algorithms to evaluate sleep duration, stages, nocturnal awakenings, and day-to-day schedule consistency across seven consecutive days and nights. Rather than relying solely on self-reported estimates, the study tracked continuous movement data and mapped it against subsequent diagnoses across more than 1,000 health conditions.
Rapid Eye Movement Sleep Patterns and Reduced Disease Risk
Deeper sleep stages also showed protective correlations, with increased deep sleep linked to a lower risk of seven conditions, including type 2 diabetes and severe depressive disorder, according to arabic.euronews.com. Each increase of about 48 minutes in this stage was linked to a relative decrease in the incidence rate of heart failure by 26%, dementia by 46%, and Parkinson’s disease by 80% during the follow-up period. Furthermore, increased duration in this phase showed an association with lower risks of immune disorders, skin diseases, obesity, type 2 diabetes, mental health disorders, and musculoskeletal problems. Beth Malove explained that it contributes to memory consolidation, while Anna Holler noted its importance for brain health, emotional regulation, and nervous system functions. Malove estimated that rapid eye movement sleep makes up about 15% to 20% of total adult sleep.
Optimal Duration Ranging Between Six and Eight Hours
While insufficient rest creates distinct vulnerabilities, the relationship between sleep duration and disease risk is not uniformly linear. القاهرة 24 reported that sleeping between six and eight hours nightly yielded the lowest risk profile across 69 out of 86 disease categories that showed a clear statistical relationship with sleep duration.
Conversely, irregular sleep timing from night to night and frequent nocturnal awakenings mapped to higher incidences of anxiety disorders and substance use issues, arabic.euronews.com stated.القاهرة 24 noted that sleeping under five hours specifically elevated risks across 37 separate health states, emphasizing that overall sleep architecture, consistency, and stage distribution carry significant weight alongside total duration.
Observational Scope and Causal Limitations
The investigation remains observational, meaning it establishes statistical correlations rather than direct cause-and-effect mechanisms. البيان reported that researchers applied strict corrections for multiple comparisons, identifying 156 statistically significant relationships between sleep characteristics and subsequent diagnoses.
However, investigators emphasized that the findings do not prove that extending REM sleep actively prevents specific diseases or that sleep deprivation directly triggers them, as underlying biological, behavioral, and environmental factors may influence both sleep architecture and long-term health outcomes.
