U.S. Blacks, Hispanics losing more sleep over worries

The National Sleep Foundation telephone poll of more than 1,000 people from the four ethnic groups also showed that more black Americans are likely to do job related work before bed.

Black Americans have long suffered from higher jobless rates than white Americans, a phenomenon that in recent years spread to Hispanics.

"So many people are suffering because of economic uncertainty," said Martica Hall, associate professor of psychiatry at the University of Pittsburgh.

"If you find yourself lying awake worrying, write a note to yourself to work on these issues the next day," she said.