Our happy hour fact to amaze your drinking buddies with.

Workers who clock more than 55 hours a week have inferior brain function to those who put in the typical 40.

Researchers tested 2,214 middle-aged British civil servants on a battery of mental skills, and found the ones who burn the midnight oil posted significantly lower scores on reasoning and vocabulary.

The study's authors warn that long hours may be as bad for the brain as smoking, and that the level of cognitive impairment they uncovered in workaholics is clearly linked to dementia later in life.

Perhaps another way to interpret the study is that folks with already compromised brain function take longer to do their jobs. Of course, bosses may already be aware of that.

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