"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
"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