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Happiness may come down to how your well-being stacks up to expectations.

CREDIT: © Martin Novak | Dreamstime.com

Americans really do love to work, it seems, while Europeans are much happier if they skip burning the midnight oil in favor of leisure. That’s according to a new study finding longer work hours make Europeans unhappy while Americans get a very slight (albeit not statistically significant) bliss boost from the extra grind.

“Those who work longer hours in Europe are less happy than those who work shorter hours, but in the U.S. it’s the other way around,”said study author Adam Okulicz-Kozaryn, a clinical assistant professor of public policy at The University of Texas at Dallas. “The working hours’ category does not have a very big impact on the probability of happiness of Americans.” [Happiest States' List]

The study, based on survey data, can’t tease out whether work causes happiness or unhappiness, though the researchers speculate the effect has to do with expectations and how a person measures success.