Why Working in 90-Minute Intervals Is Powerful for Your Body and Job, According to Science | Inc.com

It's 2:00 p.m. (...ish. You're too tired to process the exact minute.) A coworker walks by you with a sandwich from the cafeteria. Is that coffee? You know you smell coffee. You look at the clock and, like Peter's character in the movie Office Space, you realize all of two minutes have gone by. How can that be?! You've been working for an eternity. You need coffee. Such is the story of the familiar afternoon slump. And like many workers in the United States, you might feel pressured to ignore your drowsiness and just keep working. But don't do it! Your brain is sending you an urgent message you can't afford to neglect. You probably know about your Circadian rhythm, which is a biological system that controls your sleep/wake cycle over 24 hours. But you have biological cycles that are shorter than 24 hours, too. These are ultradian rhythms. Utradian rhythms have been made famous primarily through sleep study. The "father of sleep", sleep researcher Nathaniel Kleitman, figured out that pe

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• Peter Chung