5 ways cities are building 24-hour economies

Faced with the demands of growth, cities are rethinking how they operate - and when. The night-time economy is growing fast, through targeted investment and policies. In New York City alone, the night-time economy supports 300,000 jobs and generates over $35 billion per year. From late-night libraries to nocturnal tourism, sensor-driven lighting and night czars, here are just some of the ways that cities are leveraging those extra hours on the clock.