The Power of When

Learn the best time to do everything—from drink your coffee to have sex or go for a run—according to your body’s chronotype.

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Optimize Your Life

Do you know the best time for you to have sex, ask your boss for a raise, and  talk to your children? Exciting new research proves there is a right time to do just about everything, based on our biology and hormones. Dr. Breus’s The Power of When presents a groundbreaking new program for getting back in sync with your natural rhythm by making minor changes to your daily routine.

Take the Quiz and Learn Your Chronotype

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Michael Breus, PhD

Michael J. Breus, PhD, is a clinical psychologist and both a diplomate of the American Board of Sleep Medicine and a fellow of the American Academy of Sleep Medicine. He was one of the youngest people to have passed the board at age 31 and, with a specialty in sleep disorders, is one of only 163 psychologists in the world with his credentials and distinction.

Learn More About Dr. Breus »

  • “I haven’t come across this way of thinking, it is much more accurate than early bird/night owl. It takes into account a lot of good stuff, and I think this book is actually worth your time. If you’re into biohacking, you really, really want to read this book.

    Dave Asprey

    Author of The Bulletproof Diet

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  • Dr. Breus has succeeded in making the complex science of chronobiology accessible and engaging for all readers. Whether you’re looking to improve your relationships, get a raise at work, or simply lead a more fulfilling life, The Power of When is the guidebook you’ve been waiting for.

    Mark Hyman, MD

    Director, Cleveland Clinic Center for Functional Medicine

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  • The Power of When prepares you to take full advantage of our adaptation to the rhythms of nature. After reading this book, your decision-making ability will forever be improved. This is a new horizon in our understanding of human behavior, and Michael Breus masterfully presents the science as a recipe for self-improvement.

    David Perlmutter, MD

    Author of Grain Brain and Brain Maker

    Click Here for Additional Media »

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What's Your Chronotype?

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