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A 2007 bus crash in Kentucky was blamed on a driver who dozed off. A study by the National Sleep Foundation finds that transportation operators are sleepier than the average American employee, although bus operators are less likely to be suffering from a lack of sleep than pilots, train engineers and truck drivers. (Bowling Green (Ky.) Daily News via Associated Press)

A 2007 bus crash in Kentucky was blamed on a driver who dozed off. A study by the National Sleep Foundation finds that transportation operators are sleepier than the average American employee, although bus operators are less likely to be suffering from a lack of sleep than pilots, train engineers and truck drivers. (Bowling Green (Ky.) Daily News via Associated Press)

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