It probably won’t seem like much of a surprise, but a recent study from the Centers for Disease Control and Prevention has revealed that a stunning number of Americans are still not getting enough sleep. According to a report from Entrepreneur, the latest surveys revealed that adults in all 50 states and the District of Columbia are not getting the amount of sleep they need.

The CDC recommends that adults get at least 7 hours of sleep each night. Based on recent polls of more than 400,000 U.S. adults, nearly 1/3 reported getting fewer than the recommended 7 hours per night.

While you can find a sleep deprived person pretty much anywhere you go, the new study revealed some interesting geographical patterns. People in the plains region in the middle of the country were typically more rested than people elsewhere, with South Dakota raking as the top state for getting a good night’s sleep. People in southern states like Alabama and Georgia averaged fewer hours of sleep per night, and people in Hawaii were found to get the least sleep of anywhere in the nation.

Perhaps more important than location, however, is a person’s lifestyle. People who were unable to work or who were currently unemployed got less sleep on average than people who worked, and married people also had an easier time sleeping than single people. Surveys showed that 67 percent of married people got at least 7 hours of sleep each night, while only 62 unmarried people and 56 percent of divorced, separated, or widowed people got their recommended 7 hours.

People who held college degrees also reported getting significantly more sleep than others. 72 percent of graduates were getting their recommended 7 hours of sleep, surveys showed.

A press release from the CDC describing the details of the recent study can be found here.