According to a latest CDC study, one out of three Americans doesn’t get proper sleep. It has found that sleep schedules vary by race, age and geography.

As a whole, nearly 65% Americans slept for at least seven hours every night, the threshold that the authors of the survey used for defining a healthy sleep routine.

The demographic groups that get lower-than-average rates of enough sleep included non-Hispanic blacks, with 54.2% saying that they slept an average of seven hours or more per night. The rate was 53.7% in native Hawaiians and Pacific Islanders both, and 59.6% each in American Indians and Native Alaskans.

Released on Thursday, the study was compiled using the responses of 444,306 people countrywide, who were told to share their sleep routines for a 2014 survey.

The highest rate of healthy sleep was among Non-Hispanic whites with 66.8% saying that they have seven hours of rest each night.

Twitter users made fun of the results by responding to headlines regarding the study like ‘Even Our Sleep Habits Are Divided Across Racial Lines’ and ‘Nobody Sleeps Better Than White People, Says Study’.

The study said that unemployed Americans also get less than sufficient amounts of sleep that is 60.2%, and people unable to work 51% and the divorced, widowed or separated ones had 55.7%.

However, college graduates said that they receive at least seven hours of sleep each night roughly 71.5% of the time.

South Dakota was the well-rested state, with 71.6% saying that they get a good night’s sleep, under the healthy sleeping patterns discovered by the study across the Great Plains. The southeast and the Appalachians’ states had lower rates of adequate sleep.

While speaking to NPR, Anne G. Wheaton, one of the authors of the study, said that if one looks at the state map of obesity and recurrent mental distress, similar hot spots will be noticeable. ”. G. Wheaton added that these things can affect sleep.