All Work and No Play for American Workers: Who's to Blame?

Almost half of American workers did not take all of their vacation days last year, even though many reported being "burned out" by their jobs, according to a survey conducted by Yahoo Hot Jobs.

The online recruiter said 45 percent of the 1,800 respondents did not use all of their days off for 2006, while 39 percent said they were too exhausted to take a "real" vacation.

"Despite summer's reputation for being a time of travel and leisure, many U.S. workers are not using all their vacation time and are too tired to plan a getaway," the company said in a statement.

Among the top reasons cited for the lack of interest in taking time off were having too much work (36 percent), cost (34 percent) and wanting to save vacation time for emergencies (32 percent).