Poor sleep costs over-50s nearly nine months of working life, study finds

A Finnish research team has quantified something many workers sense but few can measure: the price of a bad night's sleep, compounded across years. Their findings suggest that people over 50 who struggle with severe sleep disruption lose roughly nine months of working life—time they might have spent earning, building security, or simply choosing when to step away from their jobs.

The study, drawing on data from two large Finnish cohorts, tracked sleeping patterns and work trajectories for people from age 50 onward. Researchers sorted sleep into categories: short (under seven hours), mid-range (seven to 8.5 hours), or long (nine hours or more). They also measured disturbance—the difficulty falling asleep, staying asleep, waking too early, or waking unrefreshed. The results were stark. Those with moderate sleep disturbances could expect to work nearly five fewer months in the 50-to-68 age window compared to people who slept well. Those with severe disturbances lost eight months. The effect held regardless of gender or job type.

What emerged from the data was a landscape of inequality. Professional women who slept well worked the longest—nearly 14 years past 50. Men in routine jobs with severe sleep problems worked the shortest stretch, just over 12 and a half years. The gap was not trivial. It represented real money, real security, real choice about when and how to leave the workforce. Women without sleep disturbances also outworked their male counterparts across the same age span, a finding that surprised no one familiar with how gender shapes both sleep quality and workplace power.

One unexpected finding emerged: people sleeping seven to 8.5 hours—the amount sleep science typically recommends—showed no meaningful difference in working life compared to those sleeping under seven hours. But sleeping nine hours or more was associated with shorter careers, a pattern researchers linked to the health problems that often accompany excessive sleep. Dr. Saana Myllyntausta, who led the work at the University of Turku, noted the surprise: short sleep and optimal sleep produced similar outcomes, suggesting the relationship between rest and work life is not a simple linear one.

The researchers were careful about what they could and could not claim. They had no data on mental health, physical illness, shift work, or other conditions that might drive both poor sleep and early exit from work. Sleep disturbance might be a symptom rather than a cause. But the pattern was consistent enough to warrant attention, particularly among lower-income workers, who bore the heaviest burden. The study suggested that workplaces offering cognitive behavioral therapy for insomnia or sleep health education might extend careers and, by extension, economic security for the people who need it most.

The findings arrive as one in three British workers report chronic sleep deprivation. For those in their 50s and 60s, when retirement decisions loom and financial security crystallizes, the cost of a restless night compounds across thousands of nights. The question is no longer whether sleep matters—it clearly does—but whether employers and health systems will treat it as the occupational health issue it has become.