Some of McDonald's 24-hour restaurants in the U.S. will begin serving both breakfast and dinner items between midnight and 4 a.m., the company said in a statement on Wednesday. That means not only Big Macs and Chicken McNuggets, but also Egg McMuffins and hot cakes. "It's indicative of how competitive things are," says Scott Hume, founder of BurgerBusiness.com, which reported some details of the After Midnight menu plans. "All the chains are struggling to get their numbers up."