How do you sleep at night? If you're rich, the answer is probably “really well." Research compiled by the CDC reveals that there’s a correlation between how much money you make and how much sleep you get. To no one's surprise, Americans who make less money aren't getting as much sleep as the wealthy.
This interactive map shows just how much the percentage of income made by the top 1 percent of earners around the world has changed over the last 100 years.