Which country’s citizens sleep the most and the least?

Australians sleep the most, with 31 percent reporting more than nine hours of sleep per night. The Japanese sleep the least, with 41 percent getting less than six hours of sleep a night. Seven of the 10 most nocturnal nations are in Asia, but the real party animals are in Portugal, where 75 percent stay up past midnight. (From Good Night: The Sleep Doctor’s 4-Week Program to Better Sleep and Better Health by Dr. Michael Breus)