Link may be stronger among African Americans and other minorities
Getting different amounts of sleep each night or sleeping during the day instead of at night is called irregular sleep or having an irregular sleep schedule. People who work night shifts or whose work shifts change over time may be at higher risk for this condition.
Irregular sleep had already been linked to diseases such as obesity and diabetes. A recent five-year study funded by the National Institutes of Health also found a link in older adults between irregular sleep and heart disease, the leading cause of death in the U.S.
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