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"Learning to live like an early bird," Wall Street Journal

March 4, 2008

Harvard sleep researcher offers advice for nightowls struggling to adapt to an early bird world

Wall Street Journal health reporter Melinda Beck speaks to Dr. Charles Czeisler about the science behind our sleep preferences:

"Understanding of the body's sleep/wake cycle has exploded in the past 40 years. Chronotype is partly genetic and partly due to environmental cues. In humans, the average circadian clock actually runs for 24 hours and 10 minutes, says Charles Czeisler, director of sleep medicine for Harvard Medical School. But in studies for the National Aeronautics and Space Administration, which is investigating how humans might adapt to life on Mars, Dr. Czeisler and his colleagues found that individual circadian cycles can vary by as much as an hour or so. Morning people's clocks run as fast as 23.5 hours a day, while night owls' clocks run slower."

Click here to read the entire article on the Wall Street Journal Website.

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