Energy Management

It happens a lot: You are sitting in your cubicle, and you start to yawn. Then, your eyes grow heavy. All you want to do is put your head down on your desk.

You're not the only one who feels tired at work, even among those who do little physical labor, according to a national survey released in June by Accountemps, a financial staffing specialist based in Menlo Park, Calif. The survey found that 33 percent of senior executives said 4 to 6 p.m. is the least productive time of day for employees. Noon to 2 p.m. came in second, with 29 percent.

There are ways to avoid drifting off after lunch. Workers should plan their schedules according to their daily energy cycles, said Thomas W. Morris III, president of Morris Associates Inc., a career-services firm in the District.

"Where it's high, that's where you ought to concentrate your most important work," Morris said.

Reserve routine work for when your energy is at a low point, he said. That's also a good time for physical tasks that require you to get up and moving.

If all else fails and you are still nodding off, consider a latte run. It may be safer to opt for coffee over a catnap.

-- Anjali Athavaley