For most entrepreneurs, the workday never really ends. According to a Staples survey, 98 percent of U.S. small-business owners and managers work during their time off. Many entrepreneurs continue thinking about work, even while sleeping. The "2nd Annual Staples National Small-Business Survey" discovered that 51 percent of those surveyed say they dream about work, or "sleepwork." About 70 percent of those "sleepworkers" said they put their dreams to action when they wake up. "Our customers often tell us there just aren't enough hours in the day, so it's understandable that business activity is invading sleep time," said John Giusti, vice president of small-business marketing at Staples.

Staples also found that more than 38 percent of small-business owners surveyed couldn't remember the last time they took a vacation. And the car topped the list of their favorite place to work, with 72 percent of respondents saying they make business calls while driving, while about 40 percent said they get their best ideas behind the wheel.