Graveyard-shift

There are nearly 22 million "graveyard-shift" workers in the U.S., according to online medical information provider Healthology. Up to 20% of shift workers report falling asleep on the job. These workers are more likely to experience stomach problems, colds, flu, weight gain, heart problems and higher blood pressure caused as a result of the stresses that shift work can put on a person's body.
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