A man closes the door of a shop in Cairo, Egypt, to comply with the government's order for businesses to shut down nightly at 9 p.m. Ahmed Gomaa/Xinhua News Agency/via Getty Images hide caption toggle caption Ahmed Gomaa/Xinhua News Agency/via Getty Images In Cairo, streets come alive in the evening as many people go out to shake off the stress of the day, or shop after a long day of work. These days, however, the megalopolis is quiet and dark. The government has ordered all businesses, including cafes, shops and restaurants, to close at 9 p.m. in an effort to conserve energy. Streetlights are also turned off.  "Maybe for the states or for Europe 9 p.m. is not bad, but in Egypt usually we stay out until midnight or even after midnight. So this was a big shock for lots of people," says Ahmed Kamaly , professor of economics at the American University in Cairo.…