Irregular sleeping patterns have been conclusively shown to lead to cancer in tests on mice.
A new study, published in the journal Current Biology
, adds to prior studies that have noted the damaging impact of shift work and poor sleeping patterns on health, BBC News
The researchers said the findings suggest women with a family risk of breast cancer should never work shifts.
Researchers speculate that poor sleep disrupts the body's internal biological clock, lowering immune system function and increasing the risk of disease.
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