Last year, 5.4 percent of the American workforce held second jobs, according to the US Labor Department, and that looks set to increase this year.

　　Many workers like the safety that moonlighting provides, says Carl Hausamn, the writer of "Moonlighting: 148 Great Ways to Make Money to the Side."

　　The information from the US Labor Department shows that 40 percent of US moonlighters in 1997 took a second job to meet household expenses or pay off debts. Others save money or buy some special things.

　　People also take second jobs with an eye to the future - wanting to try out a new field or gain experience.

　　Michel started moonlighting when medical systems were unstable (不稳定的). He wanted to make sure he wasn't tied to one system that ended up failing.

　　Just as the purposes for moonlighting vary, the moonlighters cross all age and racial groups. And they work in a variety of industries - no longer just service, office and sale jobs.

　　“Technology just affects your ability to make money,” Hausman says. "That makes a frequent change in moonlighting."

　　As its name means, moonlighting still occurs mostly at night. And that results in some pressures. Chief among them is time.

　　Full-time employers could misunderstand, too. Some companies do not allow after-hour work because they fear it will affect their employees' 9-to-5 performance.

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