A significant new study analyzing health data from all 3,141 counties in the United States finds that insufficient sleep is one of the strongest predictors of reduced life expectancy, second only to smoking. The findings underscore the critical importance of adequate sleep as a public health priority and suggest that improving sleep habits could be a powerful tool for extending lifespan.
The Scope of the Problem
Millions of Americans regularly fail to obtain adequate sleep. The American Academy of Sleep Medicine and Sleep Research Society define insufficient sleep as receiving less than seven hours of sleep per night. While most people recognize that poor sleep leaves them feeling tired and unfocused, fewer appreciate that chronic sleep deprivation carries serious long-term health consequences, including increased risk for heart disease, metabolic disorders, and premature death.
Until now, however, researchers have not examined the relationship between sleep and life expectancy at the local level nationwide. Understanding this relationship at the county level can reveal meaningful patterns and help local health officials identify communities where sleep health initiatives might have the most significant impact.
What the Researchers Found
The research team from Oregon Health and Science University analyzed data from the Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance System. This extensive telephone survey collects data on health behaviors and chronic conditions from Americans nationwide. The researchers examined data spanning from 2019 to 2025.
The results were striking. In nearly every state, counties with higher rates of insufficient sleep also had lower life expectancy. This relationship was statistically significant in 84 percent of states in 2019 and reached 100 percent of states by 2024. The pattern held remarkably consistent year after year.
When the researchers used sophisticated statistical models to control for other factors known to influence mortality, including smoking, physical inactivity, food insecurity, lack of health insurance, unemployment, education level, and social connections, insufficient sleep remained a strong predictor of reduced life expectancy. Only smoking showed a stronger association with reduced longevity.
Sleep Ranks Among the Top Health Behaviors
The study’s findings place sleep alongside the most well-established lifestyle factors affecting lifespan. Smoking has long been recognized as the leading preventable cause of death, and obesity ranks close behind. This new research suggests that sleep insufficiency belongs in the same conversation.
When the researchers included obesity and diabetes in their analysis, recognizing that these conditions can both cause and result from poor sleep, insufficient sleep remained significantly associated with life expectancy. This suggests that the connection between sleep and longevity extends beyond the indirect effects of weight gain and metabolic dysfunction.
A Problem That Crosses All Boundaries
Perhaps the most critical finding is that the relationship between sleep insufficiency and reduced life expectancy appeared consistently across the United States, regardless of local economic conditions, healthcare access, or whether communities were urban or rural. This universality suggests that sleep is a fundamental health behavior that matters for everyone.
The county-level analysis also creates opportunities for targeted intervention. Local health departments and community leaders can now examine sleep patterns in their own areas and develop programs to help residents improve their sleep habits. Given that sleep is a modifiable behavior, unlike genetic factors or age, it represents an area where public health efforts could yield meaningful results.
Understanding the Limitations
The researchers acknowledge several limitations to their findings. The survey data grouped people who sleep excessively, which is also associated with health problems, together with those who get adequate sleep. This suggests that the proper relationship between sleep insufficiency and life expectancy may be even stronger than observed.
Additionally, the surveys did not capture information about sleep disorders like sleep apnea, shift work schedules, or psychiatric conditions that might contribute to both poor sleep and shortened lifespan. The COVID-19 pandemic, which occurred during the study period, likely influenced sleep patterns through lockdowns and changes in work and school arrangements.
Despite these limitations, the consistency of the findings across thousands of counties and multiple years provides strong evidence that inadequate sleep is a significant public health concern.
What This Means for You
The practical implications of this research are clear. Getting sufficient sleep, defined as seven or more hours per night for adults, should be considered as crucial to long-term health as not smoking, maintaining a healthy weight, and staying physically active.
For individuals struggling with sleep, this study provides additional motivation to address the problem. Simple steps such as maintaining a consistent sleep schedule, creating a dark, quiet sleep environment, limiting caffeine and alcohol, and avoiding screens before bed can help many people improve their sleep duration and quality.
For those with persistent sleep difficulties, consultation with a healthcare provider may be warranted. Sleep disorders such as insomnia and sleep apnea are treatable conditions, and addressing them could have benefits that extend well beyond feeling more rested.
A Call for Public Health Action
The researchers conclude that their findings should inform public health strategies nationwide. Sleep health education programs, workplace policies that support adequate rest, and healthcare initiatives that screen for and address sleep problems could all contribute to improved longevity at the population level.
As evidence continues to mount that sleep is essential not only for daily functioning but also for long-term survival, the message becomes increasingly difficult to ignore. In our busy, always-connected world, making time for adequate sleep may be one of the most important investments we can make in our future health.
