Spring Fatigue May Be All In Your Head, Study Finds

A German word may be making millions of people feel tired every spring.

Every spring, a familiar complaint ripples through Germany, Switzerland, and Austria: people feel inexplicably drained even as the days grow longer and the weather improves. In German-speaking countries, there’s even a name for it, Frühjahrsmüdigkeit, roughly translated as “spring fatigue.” According to a widely cited survey by the Emnid institute, nearly four in ten women and one in five men in German-speaking countries say they suffer from it each year. Now, a year-long study suggests the fatigue they blame on spring may exist more as a cultural belief than a biological reality.

Researchers followed 418 adults for one year, checking in every six weeks, with the overall study window running April 2024 through September 2025. Nearly half the participants, 47 percent, said they personally experience spring fatigue. When the actual data was examined, fatigue scores and sleep quality showed no meaningful variation from season to season, month to month, or based on how long the days were where participants lived.

People who identified as spring fatigue sufferers reported feeling about as tired in March as they did in July, October, or January. So where does the stubborn sense that spring is uniquely exhausting come from? Lead researchers Christine Blume and Albrecht Vorster point to psychology rather than biology, with their explanation grounded in decades of research on how language and expectation shape human experience.

How the Spring Fatigue Study Was Conducted

Published as a preprint on the bioRxiv server late last year, the research was designed to test whether seasonal changes in daylight actually drive changes in how tired people feel. Blume, a sleep researcher at the University of Basel, and Vorster, a neurologist at Bern University Hospital, recruited participants from Germany, Switzerland, and Austria. Roughly 80 percent were women, and the median age was 32.

Participants filled out questionnaires on fatigue, sleepiness, insomnia symptoms, and sleep quality nine times across the year. Researchers also calculated the precise length of daylight for where each person lived at each check-in, allowing them to test whether the raw amount of daily sunlight made any measurable difference. Hypotheses and analysis plans were preregistered publicly during the study, a step that adds credibility to the findings.

What a Full Year of Data Showed About Seasonal Fatigue

Most results fell squarely on the “no effect” side. Fatigue severity showed no meaningful variation across daylight lengths, individual months, or seasons. Daytime sleepiness scores stayed flat throughout the year. Insomnia symptoms and overall sleep health showed equally stable patterns.

One partial exception is worth noting. When participants rated fatigue during daily activities on a simple sliding scale, scores did decrease somewhat as daylight hours increased. People felt slightly less drained as days grew longer. Even so, there was no spike during the rapid daylight changes of early spring, which is exactly what would be expected if the transition into the season were causing a real biological reaction. That absence is what the researchers say makes the case against spring fatigue as a genuine seasonal syndrome.

Why So Many People Still Believe in Spring Fatigue

Nearly half the participants identified as spring fatigue sufferers before a single measurement was taken. How can something be so widely felt and so absent in a full year of data?

Blume and Vorster offer a psychological explanation centered on labeling. In German-speaking cultures, Frühjahrsmüdigkeit is not just folk wisdom but a recognized concept that gets heavy media attention every March and April. When a label is readily available for a vague, unpleasant feeling, people become more likely to notice symptoms that fit it and overlook those that don’t. Research by psychologist M.H. Bornstein in 1976 showed that even color perception can shift with a verbal label: a color described as “blueish” was later recalled as bluer than it actually appeared. Similar effects show up in food research, where products with flattering labels are rated as tasting better.

Applied to fatigue, if people are primed each spring by media coverage and cultural expectation to watch for tiredness, they may experience and remember that tiredness more vividly, with no underlying biological change required. Labeling, attribution, and confirmation bias working together could explain why so many people report spring fatigue while the data shows none.

Blume and Vorster also note that spring fatigue may serve a quiet social purpose. Feeling tired when skies are gray has an easy explanation. Feeling tired when the sun is shining and everything is supposed to feel better is harder to make sense of. A named, culturally shared condition that accounts for that mismatch may be genuinely comforting, even without a scientific foundation.

Who These Spring Fatigue Findings May Not Apply To

Several caveats apply. Participants were young, mostly female, and German-speaking, which limits how broadly the results can be applied. Whether the same findings would hold in cultures where “spring fatigue” is not a recognized concept remains unknown.

Results also cannot rule out spring-related fatigue in specific groups. People with seasonal allergies may feel more drained in spring due to their immune response. Those with low vitamin D at winter’s end might experience real fatigue that happens to align with the season. Daylight saving time, which falls in late March across Europe, can also disrupt sleep for several days after the clocks change. These experiences are real and distinct but don’t account for the nearly half of participants who claim the condition.

A six-week check-in schedule may also miss a very brief effect. If spring fatigue lasted only a week or two, the study’s design might not catch it. Blume and Vorster acknowledge that while noting that none of the measured outcomes trended in any consistent direction across the year.

Millions of people will again feel sluggish this spring and reach for a familiar explanation. Based on a full year of careful measurement, that explanation may say more about the power of a shared cultural story than anything happening in the body.

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