September 6, 2026
Your sleep at 50 could reveal how many working years you have left
Plenty of people reach 50 and start counting the years until they can stop working. Their sleep is already part of that count
Workers who slept nine hours or more a night could expect to remain in the workplace for the shortest time
They spent about eight and a half fewer months in paid work than those sleeping seven to eight and a half hours
Short sleep (less than six hours), which earlier research had tied to poor work ability, made no measurable difference in this study
Saana Myllyntausta at the University of Turku led the work with nine colleagues from Finland, Sweden and the U.K
Among them were researchers at the Finnish Institute of Occupational Health and the Finnish Institute for Health and Welfare
What they measured has a name: working life expectancy, or the years a 50-year-old can expect to spend in paid work
This was an observational study rather than a trial, so the figures show which sleepers worked longer without showing that sleep is what made the difference
Eight months sounds like nothing. Myllyntausta’s team measured the loss of working life against figures from other research
It falls in the same range as carrying one or two chronic diseases. It also matches two or more risk factors stacked together, the obesity and smoking kind
Other studies have measured similar losses for job strain and heavy physical work
The working-life gap associated with long sleep was comparable to losses linked with some major health risks
Everyone answered one question about how long they usually slept, on the first survey after they turned 50. The answers went into three groups: under seven hours, seven to eight and a half, and nine or more
The team worked from two separate sets of Finns, built very differently
The larger one was 70,339 employees of Finnish towns and regional health authorities, four out of five of them women, tracked through their pension records to 2018
Short sleepers and mid-range sleepers there both finished with 13.2 years of working life ahead of them at 50, and the nine-hour group finished with 12.5
So short sleepers showed no loss in working life, while long sleepers had nearly a year less
The second set was smaller and less tidy, in one useful way. It held 6,071 adults drawn at random from the Finnish population, a fifth of them out of work when they answered
Everyone in that group had fewer working years left to begin with. Mid-range sleepers had 9.7 years left at 50, and nine-hour sleepers had 7.2, a difference of about two and a half years
The pattern was far stronger here than among the public sector employees. Every one of those employees was working at 50, which probably made them healthier than average
A second run that dropped the non-working adults from this group brought the two sets closer together
Length is one thing, and sleep quality is another
Only the public sector employees were asked about it, with four questions covering the previous four weeks: trouble falling asleep, trouble staying asleep, waking too early, and waking up unrefreshed
People reporting none of that beyond the odd night had 13.4 years of working life left at 50. Two to four bad nights a week brought it to 13.0, and five or more brought it to 12.8
Put plainly, the worse the nights, the shorter the working life
In months, that’s 4.7 fewer at the moderate level and 8.1 fewer at the severe level, with little overlap in the uncertainty around those estimates
Women reported more sleep trouble than men at both levels, and the ranking held across both sexes and all three job grades
Not every group lost the same amount of working life. The longest working life belonged to professional women reporting no sleep trouble, at 13.8 years
The shortest belonged to men in routine jobs, cleaners and maintenance workers, reporting severe sleep trouble, at 12.4 years
Sort by sleep length instead and the same workers come out lowest. Men in routine jobs or without a vocational qualification who slept nine hours or more finished last in both sets, at 12.2 years and 6.7 years
The gap between the best-off and worst-off groups was about 1.4 years among the public sector employees and about five years in the random sample
Five years is more than half of the working life an average person in that sample had left
Cognitive behavioral therapy for insomnia through workplace health services is one of two fixes the authors named. The other is education or health promotion at work
“Promoting sleep health and providing support for managing sleep disturbances at midlife may be especially important for those with a lower socioeconomic status when aiming to increase the work participation with advancing age,” the authors wrote
The authors put one caution on their own result. Nine-hour sleepers were uncommon, about 2 percent of the public sector employees and about 5 percent of the random sample. Small groups produce less reliable estimates
There’s also a real chance the long sleep is a symptom rather than a cause
Fatigue, stress, sleep apnea and depression have all been proposed as reasons somebody sleeps that long
Long sleep has separately been tied to illness and earlier death, either of which shortens a working life on its own. The study could not separate the two
Other researchers have offered an explanation for the short sleepers. People getting under seven hours tend to leave work early only when insomnia comes with it
Six hours that leave a person rested may simply be enough for that person
Sleep was measured once and never again. Somebody whose sleep improved at 55 still counts here according to how they slept at 50
The team couldn’t account for illness, drinking, smoking, or the conditions of the job itself. A second run using only the 50,081 people who never worked shifts came out the same way
The follow-up also stopped at 68, because that was as far as Finnish pension credit reached at the time. Follow the same people past that and the sleep groups could end up further apart
And this is Finland, with strong income protection and pensions built on lifetime earnings, administered through the Finnish Centre for Pensions
Whether the same arithmetic holds in the United States, where leaving work early can carry different financial consequences, remains unknown
The bigger unanswered question is whether better sleep could actually give some of that working life back
This study cannot answer it. But if sleep problems at 50 really do help determine how many working years remain, treating them could matter for much longer than a good night’s rest
The full study was published in the journal Occupational and Environmental Medicine
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