According to a 2004 survey by the U.S. Bureau of Labor Statistics, a little more than 3 percent of full-time wage and salary workers work night shifts - defined as shifts between the hours of 9 p.m. and 8 a.m.  Another 2.5 percent work rotating shifts, which can include overnight shifts.

The Cleveland Clinic in Cleveland, Ohio, reports that overnight workers suffer from a condition called Shift Work Sleep Disorder, with symptoms including insomnia, excessive sleepiness, difficulty concentrating and lack of energy. Lately, there have been some studies suggesting that overnight work can have more serious health effects.

Fact Check: Is working overnight hazardous to your health?

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Former Massachusetts Gov. Mitt Romney is warning Tea Party candidates to stay out of the November elections.

Romney, a possible candidate for the 2010 Republican presidential nomination, suggested that "Tea Party" candidates could divide the GOP vote, allowing Democrats to win.

"If there is a conservative candidate that runs in the general election, then obviously, divide and fail is the result," Romney said.

In an interview with the conservative Newsmax Web site, Romney suggested that "most" Tea Party supporters would vote Republican in a two-party race.

"Hopefully Tea Party candidates will run in respective primaries and they will either win or lose. And if they win they will go into the general," he said. "If they lose, they won't, and they will get behind the more conservative of the two finalists."

Another possible Republican presidential candidate, Sarah Palin, made similar comments last month.

Fact Check: How much of an impact do third-party candidates have in general elections?

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