Atlanta (AP) -- Sleepless in Seattle? Hardly. West Virginia is where people are really staying awake.
That's according to the first government study to monitor state-by-state differences in sleeplessness.
Nearly 1 in 5 West Virginians surveyed for the study said they didn't get a single good night's sleep in the previous month.
The national average was about 1 in 10.
In contrast, North Dakota had fewer problems sleeping, with only 1 in 13 reporting that degree of sleeplessness.
Health officials don't know the exact reasons for the differences.
But experts noted several possible explanations.
West Virginia ranks at or near the bottom of the nation in a variety of health measures, including obesity, smoking, heart disease and the proportion of adults with disabilities.
Studies have increasingly found sleeping problems in people with certain health problems, including obesity.
(Copyright 2009 by the Associated Press. All rights reserved.)