Andrew Tsunis, a 46-year-old attorney in Manhattan, says he doesn't need strong coffee or a hearty breakfast to get through the day. He needs a nap.

He gets one at Yelo, a corporate wellness center on West 57th Street that offers naps, in 20- to 40-minute increments, for $24 or less. (The center also offers reflexology for the feet, hands, and ear.)

"It's like recharging my batteries," says Tsunis. "I leave my BlackBerry behind. I'm not looking at any deals; the phone's not ringing. I'm not staring at something that needs to be done. I take a vacation from the world."

Even in the city that never sleeps, busy professionals need their rest. Yet it is still something of a departure for a business culture that brags about working 24/7. Can the power nap ever rival the power lunch?

Yelo and another Manhattan center that offers naps, MetroNaps, seem to think so-as do a number of corporations.

New York is the ideal location, says Yelo's founder, Nicolas Ronco. Why? Because it's stressful, the price of real estate is so high that people crave private space, and the city has tons of commuters: 3.5 million a day.

"We have a number of executive clients, because we cater to that population," he says.

Yelo, which opened in February, is negotiating corporate membership deals with Hearst, Newsweek, and Random House, and finalizing one with Time Warner, Ronco says.

MetroNaps, located in the Empire State Building, was started in 2004 by Arshad Chowdhury, a newly minted M.B.A. from Carnegie Mellon. He says he came up with the idea while working as an analyst at Deutsche Bank and watching people fall asleep at their desks in the middle of the day.

Unlike Yelo, MetroNaps offers no spa services. Naps cost $14 for 20 minutes. But Chowdhury's innovation is to sell not just naps but also his EnergyPod-a sleek cocoon that customers settle into-directly to clients.

"Very quickly we learned that our original business model-operate like a gym, attract members, offer napping facilities, and expand through a franchise program-had to change," he says.

Customers did not want to walk more than 5 to 10 minutes to take a nap, he discovered. They wanted to nap nearby. To better accommodate them, Chowdhury sells ($12,485) or rents ($10 per employee, per month) his pods to clients, including hospitals, universities, spas, and companies like Procter & Gamble and Cisco Systems. Rental fees include the EnergyPods themselves, usage tracking, and sleep seminars to get employees napping.Cisco is using Energy Pods at its campus in Research Triangle, North Carolina, in a pilot program that is "part of our ongoing effort to support employee health and wellness, and improve productivity and the services we provide to our customers," Cisco said in an email statement.