(CBS SF) – About one-third of California adults are getting less than the recommended seven hours of sleep, according to a new national study.

A survey by the Centers For Disease Control and Prevention of more than 444,000 adults nationwide found about 66.4 percent of Californians said they received more than seven hours of sleep a night.

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Nationally, about 65 percent of Americans said they slept the recommended amount. South Dakota residents had the highest percentage, 71.6 percent. Residents of Hawaii had the highest percentage of sleep-deprived people in the survey, with only 56.1 percent saying they slept at least seven hours.

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Researchers found those who are married, people who were employed and those with college degrees reported higher levels of healthy sleep.

The CDC also found ethnic disparities when it comes to sleep deprivation. Blacks, American Indians/Alaska Natives, Native Hawaiians/Pacific Islanders and those who are multiracial were less likely to report that they slept seven hours or more.

Sleeping less than seven hours a night may lead to increased risk for obesity, diabetes, high blood pressure, heart disease and stroke, according to the CDC.

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Tim Fang is a digital producer for CBS San Francisco and a native of the Bay Area. Follow him on Twitter @fangtj.