Quiz: US Trends II
Question 1 of 17Your score: 0
Over the last one hundred years, the average number of hours of sleep per night in the U.S. has fallen. How much less do Americans sleep than they did one hundred years ago?
Over the last one hundred years, the average number of hours of sleep per night in the U.S. has fallen. How much less do Americans sleep than they did one hundred years ago?