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The Power of When: Discover Your Chronotype--and the Best Time to Eat Lunch, Ask for a Raise, Have Sex, Write a Novel, Take Your Meds, and More Hardcover – September 13, 2016

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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.

Most advice centers on what to do, or how to do it, and ignores the when of success. But exciting new research proves there is a right time to do just about everything, based on our biology and hormones.

As Dr. Michael Breus proves in
The Power Of When, working with your body's inner clock for maximum health, happiness, and productivity is easy, exciting, and fun. The Power Of When presents a groundbreaking program for getting back in sync with your natural rhythm by making minor changes to your daily routine.

After you've taken Dr. Breus's comprehensive Bio-Time Quiz to figure out your chronotype (are you a Bear, Lion, Dolphin or Wolf?), you'll find out the best time to do over 50 different activities. Featuring a foreword by Mehmet C. Oz, MD, and packed with fascinating facts, fun personality quizzes, and easy-to-follow guidelines,
The Power Of When is the ultimate "lifehack" to help you achieve your goals.
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Editorial Reviews

Review

"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

About the Author

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. Dr. Breus has been featured on The Dr. Oz Show more than 30 times and writes regularly for The Huffington Post, The Dr. Oz Blog, and Psychology Today. He is the author of The Sleep Doctor's Diet Plan and Beauty Sleep.

Product details

  • Publisher ‏ : ‎ Little, Brown Spark; Large Print Edition. (September 13, 2016)
  • Language ‏ : ‎ English
  • Hardcover ‏ : ‎ 384 pages
  • ISBN-10 ‏ : ‎ 0316391263
  • ISBN-13 ‏ : ‎ 978-0316391269
  • Item Weight ‏ : ‎ 1.3 pounds
  • Dimensions ‏ : ‎ 6.5 x 1.25 x 9.5 inches
  • Customer Reviews:
    4.3 4.3 out of 5 stars 1,619 ratings

About the author

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Michael Breus
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Michael J. Breus, Ph.D., 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. With a specialty in Sleep Disorders, Dr. Breus is one of only 163 psychologists in the world with his credentials and distinction.

Dr. Breus is also the creator of The Dr. Breus Bed®, the first and only mattress collection ever designed by a sleep specialist. He has also pioneered a line of solution based pillows in The Dr. Breus Pillow collection, now available on Amazon.com.

Dr. Breus is the author of The Sleep Doctor's Diet Plan: Lose Weight Through Better Sleep (Rodale Books; May 2011), a groundbreaking book discussing the science and relationship between quality sleep and metabolism. His first book, GOOD NIGHT: The Sleep Doctor's 4-Week Program to Better Sleep and Better Health (Dutton/Penguin), an Amazon Top 100 Best Seller, has been met with rave reviews and continues to change the lives of readers. It is now available in paperback as BEAUTY SLEEP: Look Younger, Lose Weight, and Feel Great Through Better Sleep.

As the subject of sleep continues to gain momentum in our sleep-deprived society, Dr. Breus has become a widely recognized leader in this ever-evolving field. Dedicated to raising awareness of both medically diagnosed sleep disorders and the importance of quality sleep for all, Dr. Breus is on a mission to develop innovative education and communication programs.

In addition to his private practice, where he treats athletes and celebrities alike, Dr. Breus also trains other sleep doctors and consults with major airlines, hotel chains, mattress manufacturers and retailers to provide the optimum sleep experience for their customers. His audio relaxation CD distributed in Crowne Plaza Hotels helps millions of people fall asleep each year; and for over 14 years Dr. Breus has served as the Sleep Expert for WebMD and frequently pens "Sleep Matters" a column in WebMD magazine. Dr. Breus also writes The Insomnia Blog, which appears regularly on WebMD, The Huffington Post, The Dr. Oz Blog, Psychology Today, MedPedia, Organized Wisdom, Travora Travel, and Furniture Today.

Dr. Breus has provided editorial services for numerous medical and psychology peer-reviewed journals and has given hundreds of presentations to professionals and the general public. Among his numerous national media appearances, Dr. Breus has been interviewed on CNN, Oprah, The View, Anderson, and The Doctors. He also appears regularly on The Dr. OZ Show and Sirius XM Radio.

Customer reviews

4.3 out of 5 stars
4.3 out of 5
1,619 global ratings
Don't sleep on the idea of buying this book...buy it now!
5 Stars
Don't sleep on the idea of buying this book...buy it now!
I dove into this book and thoroughly enjoyed it. The author presented his findings and expertise in a way that was engaging and accessible. I like how it was arranged so that you didn't have to read the book from cover to cover. Essentially you can read the first part of the book and then cherry pick the middle section to determine what you'd really like to work on. I really enjoyed that.This area of research is fascinating to me so I'm probably a bit biased in my review, but I felt that the overall structure and cadence of the book was great. If you are looking to feel good about how your body clock is wired and want practical and tactical ways to adhere to what your body is telling you in terms of sleep, food intake, exercise, and someone, then give this book a read before you read any other sleep book. This book will definitely get you thinking positively about making changes and embracing your body clock so that the changes you make are sensible and best suited for you and your lifestyle.A book that is long overdue and I'm glad that I read it.
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Top reviews from the United States

Reviewed in the United States on September 22, 2016
WHO IT'S FOR: Everybody who wants to manage their energy better and get more stuff done, especially if you feel like you're out of sync with the rest of the world. Hugely useful for "wolves" who tend to stay up late, "dolphins" with erratic sleep patterns, and "lions" who lose steam early in the evening.

WHY IT'S IMPORTANT: One of the most puzzling thing about medical practice is how long it takes for really good research to actually become everyday practice. I remember how it blew my mind as a med student to find out that it took 20+ years for antibiotic ulcer therapy (vs ineffective antacids) to finally take hold as standard practice amongst docs. Now, Dr Breus has brought to us the life-changing science of CHRONOTYPE in super-digestible form so you know a) what *your* biorhythms are and b) how to use them to live better. It's not a minute too soon.

Chronotype is genetically determined; it's as immutable as your eye color. And chances are, right now you don't know what your chronotype is. As a result, you may have spent a lifetime putting yourself down, wondering what the heck is wrong with you, and struggling to adapt to the rest of the world. Well, struggle no more. It's like one day discovering you're gluten-sensitive, stop eating bread, and having this chronic problem you thought you were going to have for the rest of your life suddenly go *poof* and vanish.

WHAT I LIKE ABOUT IT: The book starts with quizzes to determine your chronotype. Then, based on your type, it tells you the optimal time to engage in various activities -- and the time to definitely *avoid* those activities (e.g. *never* argue after 11pm). Breus has made this super-streamlined, logical, and easy to use. He even has timelines for your ideal day specific to your chronotype, taking the guesswork completely out of it. Just grab your recipe and go. Breus has also been a practicing sleep doc for 15+ years, so he's speaking from experience, not speculation. This is cutting-edge science that works, folks.

WHY YOU SHOULD GET IT: You may not have known that you have a chronotype, but it's been running your life the whole time. Instead of continuing to get things wrong, might as well know the science behind the best time to sleep, eat, work, exercise, have sex, get a vaccine, be creative and a whole bunch more, so you can live your happiest, most productive and flourishing life. It may also solve a lot of mysteries about how you're "weird", thereby lifting off your shoulders a lifelong burden of self-recrimination. An essential reference for active humans.
-- Ali Binazir, M.D., M.Phil., Happiness Engineer and author of 
The Tao of Dating: The Smart Woman's Guide to Being Absolutely Irresistible , the highest-rated dating book on Amazon for 4+ years
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Reviewed in the United States on September 13, 2016
Dr. Michael Breus has written a book that will cause you to rethink virtually every area of your life. This book is about so much more than just time management and when to do things, it explores your Chronotype and breaks down more than 100 circadian patterns to discover your personal best time to do everything based on your chronotype.

The book starts with a simple quiz that helps you determine your Chronotype. Chronotype is the scientific study and classification of your personal biological energy patterns based on circadian rhythms. Everyone has a unique chronotype that determines your peak energy flows throughout the day. The book also helps you understand the positive combination of hormones with your peak energy states in every area of your life. By understanding the critical combination of hormone production and energy you can time the best time of the day to do everything.

After taking the quiz, I found out I was a bear chronotype. I've begun using the timing suggestions for when to sleep and wake up and when to be most effective in my work and so far, I've woken up more refreshed every day. It did require that I make a change to when I went to bed and got up. There is a formula for determining your best time to sleep based on your chronotype. I also moved as much of my work as I could that required strong problem solving into different areas of the day and it has made a significant difference in my ability to focus.

Each chapter focuses on a specific topic like when to exercise, when to have sex, when to focus on creative efforts, or when to sleep and breaks the chapter down for your chronotype. I like the specificity of each section for the chronotype. After a brief introduction to the topic of each chapter you can dig into what is relevant to you. It is important to read your spouse or partner's chronotype as well to better understand their daily patterns so that you can maximize or improve your interactions with them. I was surprised to find out that my chronotype should have sex on Saturday mornings!

I like this book because it is supported by evidence based studies. The title might make you think that it is based on pop psychology or made up idees, it is not. While very easy and fun to read, it brings serious science to bear and provides you with a great jumping off point if you want to dig into the research. I also like all the additional resources and video explanations on the authors website, he gives you more examples, details and exercises that you can do to become more efficient at maximizing your personal chronotype.

While I got an early review copy of the book, I found it so intriguing that I bought it for my employees and close family members. I really feel like this is a book that everyone needs to read to finally understand how and when to sleep and how to properly time their day to reach maximum effectiveness throughout the day.
131 people found this helpful
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Reviewed in the United States on February 24, 2017
Some really good kernels of info, interspersed with a bit of cheese that I could do without (as is often the case with most books in this vein). I've been able to adapt some concepts with good effect, and the overall structure he's built to describe the different chronotypes makes it fairly easy to learn.

Didn't like the books format much; its intended to allow you to jump around and look up specifically what's relevant to you, but I just found it disruptive and it made for a very choppy read and recollection. I would have preferred more flow overall, with the reference material grouped together. However, its easy to critique this as a reader and much hard to actually organize the writing effectively, so perhaps this was the only way he could make it work.

Hovering between 3 and 4 stars... but I'll give the benefit of the doubt and set it at 4, if only because I have in fact adopted some of the things he outlines into my daily life.

If, in weeks or months, my life has transformed amazingly like some of the anecdotal examples provided in the book, then i'll come back and give it a 5 star and provide an update to the review.

FYI. I'm a dolphin. Or a wolf. It varied, but the book does more or less say that you don't have half-half... that you're going to be one with variations, etc. Because of that inconsistency in my own chronotype, it has made it harder to know which schedule I need to follow to make improvements and I've had to do some experimenting with both. I expect if you fall more squarely into one of the 4 types its probably easier to know exactly which changes to make and you may have more success than I.
33 people found this helpful
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Top reviews from other countries

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Amazon Customer
5.0 out of 5 stars life changing
Reviewed in Canada on November 12, 2022
Life changing book for real

It’s crazy how much knowledge there is in that book

Very trust worthy and life changing book
Berto
5.0 out of 5 stars Assolutamente un 5 stelle
Reviewed in Italy on April 3, 2021
Un libro che ognuno di noi dovrebbe leggere e prender spunto!
Client d'Amazon
2.0 out of 5 stars For newbies
Reviewed in France on February 18, 2020
The book is rather simple. Makes reference to a few studies here & there. If you're a newbie to readings on healthy lifestyles it may be good enough. If you're already tracking your sleep, eating healthily for your body type, etc it may be too basic.

It's written for the average corporate-job people. The schedules suggested are linked back to the "usual" 9-6 work hours. If you're searching for a solution to adapt to that, the book offers advice. Since I was searching for a way to live my life in accordance to my rhythm, to changes in daylight, times zones, etc I got little interesting information. It just didn't make sense to me to read "bears get up with the sun" & afterwards getting a fit-all advice on waking up at 7am (it's pitch-black during winter & sunny during summer).
One person found this helpful
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Jesús Osorio
5.0 out of 5 stars Simple tips can change your life (and the way you sleep)
Reviewed in Mexico on October 24, 2017
A friend recommneded to me this book, I did the test and then it got even more interesting, I bought the book, kept reading and practicing base on my chronotype and after two weeks I can say I'm getting more conscience about the importance of sleeping well, eating well, and understanding the others and the best time to talk to them or even to argue, arguing is part of life, chosing the right moment can end into a good conclusion learning, the world needs to be different, it we do our work then the closer, the family, neigbors, colleagues, the society itself can change for better.
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S. Wellinghaus
5.0 out of 5 stars Viel Hintergrundwissen zum Thema Schlaf
Reviewed in Germany on October 25, 2017
Über einen Brigitte-Zeitschriftenartikel bin ich auf Michael Breus aufmerksam geworden, einen amerikanischen Schlafforscher. Er teilt die Menschen grob in vier verschiedene Schlaftypen ein und erklärt in einfachen Worten, was medizinisch-biologisch hinter unseren Biorhythmen steckt. Einiges davon mag etwas schematisch erscheinen, speziell weil es vermutlich zahlreiche "Mischformen" in der Chronobiologie gibt. Aber alles in allem gibt Breus viele gute Hinweise, wie man sich den Schlaf in der Nacht zurückerobern kann. Lesenswert.
P.S.: Der Nobelpreis für Medizin ging in diesem Jahr an Forscher, die zur "inneren Uhr", also der Chronobiologie geforscht haben.
3 people found this helpful
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