The Power of When: Learn the Best Time to Do Everything by Dr Michael Breus —Book Summary and Review

The Power of When —Book Summary

3.54 (1,433 ratings by Goodreads)

The Power of when presents the latest research shows that there is a right time for all of us to do everything, from drinking a cocktail to getting a flu shot. The catch? That ‘right time’ varies from person to person.


We go by our daily lives and do not consider if we do simple things like walking, going to bed, etc. at the right time. Like everyone else, I never gave much thought to that except to the frequent reminders by mom to go to bed earlier for the benefit of my health. However, I was fascinated by the circadian system, also known as the ‘biological clock’, which affects every area of the body, controlling everything from the multiplication of cancer cells to the integrity of the immune system.

People often identify themselves with two simple ideal, that is the “early birds” or “night owls” but Breus said there are more chronotypes. Chronotypes refer to the classification of the general timing of your biological clock.

For example, the gut has a circadian pacemaker of its own – when it is not on its biological clock schedule, hormone disruption causes increased levels of inflammation, inefficient metabolism and that’s when you will notice the phrase ‘growing sideways’ turn into reality.

Therefore when I came upon this book, I immediately got myself a copy after seeing the summary in my Kinokuniya members’ newsletter: “Read this book to unlock knowledge and understanding of ‘when’ you function best, and ‘when’ others work best, to allow you to put your best ideas forward, be most creative, and be open to instruction. This book will enable you to learn ‘when’ you can indeed be your best on many levels”.

According to clinical psychologist and sleep specialist Dr Michael Breus, your genetics can tell you when it is the perfect time to do just about anything.

“It’s biologically driven. It’s based on your genetics. As a matter of fact, it’s the PER3 gene that actually the length of it tells us a lot about what time you want to sleep and how much you want to sleep,” Dr Breus shared in his book, “The Power of When: Discover Your Chronotype”, where he explained how matching your schedule to your chronotype can help you live a healthier, more productive life.

His research proves there is a right time to do just about everything, based on our biology and hormones – working with your body’s inner clock for maximum health, happiness, and productivity is easy, exciting, and fun.
Your chronotype is your internal, biological clock, which helps determine when to sleep when to wake, when to eat, and when to do many other things that we take for granted in life.

Traditional sleep researchers have categorised five different chronotypes, and everybody has one. Still, unsatisfied with the existing set of chronotype measures typically used in research, Dr Breus created his own for this book.

The research shared by Dr Breus in his book is that the vast majority of people (fifty per cent or more) are, like me, Bears. The other three categories equally make up the remaining fifty per cent and tend to be less in sync with social norms.

According to Dr Breus, these groups do not run on the same bio-time, nor do they have the same metabolism. He also spends some time ensuring you understand there are no hybrid chronotypes, and you really need to pick the single category that best fits with your actual behaviours.
The second part of the book is devoted to significant life areas: relationships, fitness, health, sleep, eat and drink, work, creativity, money, and fun. Each chapter is devoted to a deep-dive in each of these sections and talk about the failure, success, and science behind the topic, as well as what each chronotype should strive to do.

For instance, in the chapter on sleep, the author discusses waking, napping, sleeping in, and bedtimes – Should you sleep in on the weekends? What kinds of things can you do to be more awake during the day? The idea is that if you follow the advice and formulas that correspond with your chronotype, you will live a more fulfilling, healthier, and happier life.


Chronotypes can also come in handy when finding a partner – you would better understand yourself and others – especially those with a different chronotype than your own. For example, Breus explained that lions and wolves do not go very well together because of their different sleep schedules.

“If you’re a lion and you’re an early riser, by 8:30 [p.m.] you’re done,” Dr Breus shared. “If you’re a wolf, that’s the time you’re ready to get going.”

The third part of the book details your chronotype’s interaction with seasonal patterns (including a woman’s monthly pattern), and how chronotypes shift as we age.

“By the time I hit 50, 55, I’m going to start to move more into a dolphin or lionesque stage … because there’s a depletion of melatonin as we age,” added Dr Breus.

In a nutshell, you should read this book if you would like to learn more about how your natural biological, inherited rhythms affect every aspect of your life. This understanding of your innate clock may perhaps unlock knowledge about yourself and the needs that fit best with your chronotype.

A quick look at the chronotypes


Those who like to go from A to B to C. They like to kind of things in a very particular order and hate any deviation. They are very early risers.

credit – cbnsnews


The extroverts that people want to hang out with. Breus describes bears as the “glue of society”.

credit – cbnsnews


Wolves are night owls. Those who like to stay up late and love to sleep in. Most of the time, they don’t need a tremendous amount of sleep.

credit – cbnsnews


The intelligent yet problem sleepers. Typically they have a little bit of obsessive-compulsive to them, so much to the point that sometimes they don’t get stuff done.

The Power of When — Book Review

3.54 (1,433 ratings by Goodreads)

The latest research shows that there is a right time for all of us to do everything, from drinking a cocktail to getting a flu shot. The catch? That ‘right time’ varies from person to person. When we stop focusing on the ‘how’ and ‘what’ of our lives and start focusing on the ‘when’, we reveal our body’s natural schedule and unlock our hidden potential.

The book is rated 3.54/5.00 on Goodreads, but personally, the book isn’t my cup of tea. Maybe because kind of horoscope type of reading. Nonetheless, the book do give an interesting guideline on how to schedule and time your daily activity. So, that’s the plus point.

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 MoreThe 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 by Michael Breus
My rating: 3 of 5 stars

It really an easy book to read. But the content might not be my cup of tea.

View all my reviews




Author: Muhamad Aarif

A notorious book addict by night and an oil and gas executive by day. As Mark Twain said, "The man who doesn't read good books has no advantage over the man who can't read them." So, read, read, and read some more.

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