Outsleeping early humans.

• Position: HEALTH - Brief article

For years, experts have warned that getting much less than eight hours of sleep can be harmful to your health. But a new study suggests that people in prehistoric times got less sleep than we do today and probably didn't suffer from it healthwise. Researchers analyzed the sleeping habits of 94 members of three hunter-gatherer tribes in Africa and South America that have no electricity and live as their ancestors did for thousands of years. They found that the modern tribespeople typically sleep six-and-a-half...