Sleep here. For a fee. If crashing at work is off limits, treat yourself at a nap boutique - if one exists in a downtown or shopping center near you. New York City'sYelo, a corporate wellness center, offers clients $24 naps in private sleep cabins (aptly named YeloCabs) for up to 40 minutes. AtMetroNaps, on the 22nd floor of the Empire State Building, weary souls can climb into an EnergyPod and doze off to tranquil music. At the Mall of America, in Bloomington, Minnesota,Power Nap Sleep Centersprovide shoppers a horizontal break for 70 cents a minute.