(CNN)It's well known that the wealthy have more than the average human, including exorbitant real estate, sports cars and fine jewelry. But they also have more of something else -- sleep.
The rich have one more thing you don't: Better sleep
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Compared to those living near or below the poverty level, the rich sleep more too, according to a study by the US Centers for Disease Control and Prevention. The agency surveyed nearly 140,000 adults in the United States between 2011 and 2014 and found that the more money someone made, the more likely they were to get a full night's rest.
Of the adults surveyed, only 55% of people living below the poverty threshold received seven to eight hours of sleep per night. For adults making 400% above the poverty threshold, that number rose to 66.6%. In 2014, the poverty threshold was $11,670 for a single-person household and $23,850 for a four-person household.
This particular study did not address the negative consequences of not getting enough sleep, said Lindsey Black, an epidemiologist at the CDC. However, there have been other studies that show multiple negative consequences from sleeping too little, she said.
"Sleep affects many aspects of well-being and quality of life for people of all ages," Black said. Poor quality sleep has been associated with increased risk of diabetes and heart disease, mental health issues such as depression, and driving accidents, she said.
The study also did not look into why the rich sleep more than the poor, but Dr. Neil Kline, a sleep physician at the American Sleep Association, said there could be multiple reasons.