Sleep physiologist Martin Moore-Ede. He is founder and president of Circadian Technologies, Inc., which helps shiftworkers cope with night shifts and rotating work schedules. He provides assistance to companies that are open round the clock. Dr. Moore-Ede is a professor at Harvard Medical School, and is the author of the newly published "The Twenty-Four Hour Society: Understanding Human Limits in a World That Never Stops." (Addison Wesley).