Restaurant franchisees stand to bring in more sales in some markets by operating around the clock, but they'll also pay more in wages and overhead to serve a less-than-regular late-night clientele, experts say. Franchisees for chains including McDonald's and Dunkin' Donuts have dramatically increased the number of open-all-night outlets; experts advise franchisees to get to know the rhythm of the neighborhood before deciding whether to extend hours.

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