Automotive Holiday Deals Up to 50% Off Select Books Shop Men's Athletic Shoes Learn more nav_sap_SWP_6M_fly_beacon Indie for the Holidays egg_2015 All-New Amazon Fire TV Luxury Beauty Gifts Under $50 May The Best Garden Be Yours Amazon Gift Card Offer bf15 bf15 bf15 $30 Off Amazon Echo $15 Off All-New Fire Kindle Black Friday Deals Outdoors Gift Guide on DOTD
Internal Time and over one million other books are available for Amazon Kindle. Learn more

Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required.

  • Apple
  • Android
  • Windows Phone
  • Android

To get the free app, enter your email address or mobile phone number.

Internal Time: Chronotypes, Social Jet Lag, and Why You're So Tired Tra Edition

24 customer reviews
ISBN-13: 978-0674065857
ISBN-10: 0674065859
Why is ISBN important?
This bar-code number lets you verify that you're getting exactly the right version or edition of a book. The 13-digit and 10-digit formats both work.
Scan an ISBN with your phone
Use the Amazon App to scan ISBNs and compare prices.
Sell yours for a Gift Card
We'll buy it for $8.55
Learn More
Trade in now
Have one to sell? Sell on Amazon
Buy used On clicking this link, a new layer will be open
$20.79 On clicking this link, a new layer will be open
Buy new On clicking this link, a new layer will be open
$26.95 On clicking this link, a new layer will be open
More Buying Choices
25 New from $21.53 20 Used from $15.45
Free Two-Day Shipping for College Students with Amazon Student Free%20Two-Day%20Shipping%20for%20College%20Students%20with%20Amazon%20Student

Take an Extra 30% Off Any Book
$26.95 FREE Shipping on orders over $35. In Stock. Ships from and sold by Gift-wrap available.

Frequently Bought Together

  • Internal Time: Chronotypes, Social Jet Lag, and Why You're So Tired
  • +
  • Dreamland: Adventures in the Strange Science of Sleep
Total price: $48.90
Buy the selected items together

Special Offers and Product Promotions

  • Take an Extra 30% Off Any Book: Use promo code HOLIDAY30 at checkout to get an extra 30% off any book for a limited time. Excludes Kindle eBooks and Audible Audiobooks. Restrictions apply. Learn more | Shop now

Editorial Reviews


Internal Time is an accessible, up-to-date overview of a subject that is important to all of us. With its remarkable depth and breadth of coverage, this book should be of interest to a wide and diverse audience. (Martin Zatz, Editor, Journal of Biological Rhythms)

This is a wonderful book from a gifted scientist, thinker and writer that provides the reader with the rare opportunity to discover something new about themselves and the world in which they live. (Russell G. Foster, University of Oxford)

In Internal Time, Till Roenneberg, a chronobiologist at the Ludwig-Maximilians University in Munich, Germany, takes readers on a journey through this mysterious area of science. He explores why some people are larks and others owls, why jet lag can be so debilitating to travelers, and why teenagers struggle to get out of bed in the morning...Roenneberg is a knowledgeable guide, with a talent for making difficult concepts clear and convincing...This is a fascinating introduction to an important topic, which will appeal to anyone who wishes to delve deep into the world of chronobiology, or simply wonders why they struggle to get a good night's sleep. (Richard Wiseman New Scientist 2012-04-28)

Time really is of the essence, says medical psychologist Till Roenneberg. By neglecting our body clocks--which rarely run in synchrony with the crazily cranked-up pace of modern life--we can develop "social jetlag," endangering our health and careers. Roenneberg has built his book on decades of research in everything from fungi and single-celled organisms to humans. In brilliantly minimalist terms, he explains the temporal mismatches behind teen exhaustion, early birds and night owls, and sleep phobia. (Nature 2012-04-01)

Internal Time is a cautionary tale--actually a series of 24 tales, not coincidentally. Roenneberg ranges widely from the inner workings of biological rhythms to their social implications, illuminating each scientific tutorial with an anecdote inspired by clinical research...Written with grace and good humor, Internal Time is a serious work of science incorporating the latest research in chronobiology...[A] compelling volume. (A. Roger Ekirch Wall Street Journal 2012-04-27)

Till Roenneberg's book is an engaging and informative layman's introduction to circadian science and its implications for contemporary humans...By integrating quality scientific exposition with well-rounded human vignettes, Roenneberg's book shows how sophisticated human behaviors arise partly from our embodied earthly nature. (Greg Murray Times Higher Education 2012-05-03)

Internal Time made me think deeply about what it means to be a time-bound organism: about the ways we live in time and the ways time lives in us. It is, in an unusually literal sense, a book about what makes us tick. (Kathryn Schulz New York 2012-04-29)

A brilliant book. (William Leith Telegraph 2012-05-31)

Fascinating...Other books have dealt with our biological clocks, but Roenneberg focuses on the ways in which societal pressures seem to be leading us to disregard our clocks, at considerable cost. (Rob Dunn Wilson Quarterly 2012-06-01)

About the Author

Till Roenneberg is Professor at the Institute of Medical Psychology at the Ludwig-Maximilians University, Munich.

Hero Quick Promo
Holiday Deals in Kindle Books
Save up to 85% on more than 1,000 Kindle Books. These deals are valid until November 30, 2015. Learn more

Product Details

  • Hardcover: 288 pages
  • Publisher: Harvard University Press; Tra edition (April 30, 2012)
  • Language: English
  • ISBN-10: 0674065859
  • ISBN-13: 978-0674065857
  • Product Dimensions: 1.2 x 5.8 x 8.5 inches
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (24 customer reviews)
  • Amazon Best Sellers Rank: #394,622 in Books (See Top 100 in Books)

More About the Author

Discover books, learn about writers, read author blogs, and more.

Customer Reviews

Most Helpful Customer Reviews

Format: Hardcover Verified Purchase
First off, I am not a subject matter expert in the realm of "chronobiology". But what Ronneberg describes in this short and very readable introduction to our internal body clocks was my life for the last third of my 30-year military career. As a result, while I can't recommend the book from the researcher angle, I can highly recommend the book from the subject angle. In short, I'm a fan and HIGHLY recommend this book.

Bottom line, Ronneberg's thesis is this: our body clock(s) is(are) real, performs(perform) very important calibrating functions and messing with it(them) has very serious consequences. And from personal experience, I would have to agree. I violated pretty much every "rule" in his book and I wound up paying a very heavy price. Fortunately (though it didn't seem so at the time), mandatory retirement arrived and an inability to go back to work in a second career provided an opportunity to get my clock(s) resynchronized (though not having yet read the book, I had no idea what I was doing other than following what my body was telling me I needed to do).

So what did I do wrong? Well, my work generally entailed long hours in a windowless, fluorescent-lighted, office (no connection with the natural light/dark cycle); too-often, middle-of-the-night phone calls (interrupted sleep cycles); frequent trips across up to 8-10 timezones where I was expected to be at work "bright & early" the day after travelling (unending two-way jet lag); and meetings/events at all hours of the day lasting anywhere from one hour to all day ("social jet lag").
Read more ›
2 Comments Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
13 of 13 people found the following review helpful By Fiona Leonard on September 20, 2013
Format: Kindle Edition Verified Purchase
There are some books that immerse you in a topic and you come away feeling wiser and inspired. Then there are other books that lead you to the edge of learning, throw you a few tasty morsels and then turn off the lights and send you away. For me, Internal Time: Chronotypes, Social Jet Lag and Why You're So Tired, sits squarely in the latter category.

This is a book about the science of sleep. According to the science, sleep is not something that is governed entirely by choice. Instead, it is something deeply rooted at our cellular level. While we have control over when we want to wake and sleep, at our core there is a mechanism that has preset when we should wake and sleep. Not only does this impact on how we feel, but also how we digest, think and function. This sleep preset is, however, not fixed, rather it follows a natural pattern over the course of our lives - varying with age. There is also a divergence between male and female sleeping patterns.

As the book clearly sets out, how we should sleep is profoundly affected by our need to conform to social expectations, whether those are preconceived notions of effectiveness ("the early bird catches the worm") or simply by the fact that we are required to be at work or school at a proscribed time.

The book is set out in 24 chapters (yes because there are 24 hours in a day) and each one begins with a case study/story and then goes on to explain the science behind it. The chapters makes for fascinating reading and there were plenty of sections that I found enlightening and highlighted to come back to. I read this book quite quickly because I was looking forward to getting to the advice section - "Here's how to manage sleep/jet lag/chronotypes etc" - except that part never comes.
Read more ›
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
11 of 11 people found the following review helpful By AngliGreek on February 25, 2013
Format: Hardcover Verified Purchase
The author takes scientific studies and data, and makes them highly accessible. He transforms their results into clever postmodern parables about how we live our lives, to show why so many of us are out of sync with the itinerary of our minds and bodies. He looks at what makes some folks 'morning' people and others 'night' people; why and how we sleep; how our internal time clocks affect the degree to which we experience pain, when we feel like eating or being intimate; and why many of us are barely making it through our day jobs.

Roenneberg also tackles the unreasonable expectations of our culture, what really happens to us when we travel, and how people and animals respond to changes like Daylight Savings Time. The book was so fascinating, I couldn't put it down!
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse
9 of 9 people found the following review helpful By Vikrum Sequeira on December 20, 2012
Format: Hardcover Verified Purchase
I saw a link to this book in a science blog and ordered it. It is a fascinating read - the author illustrates his points about different chronotypes with stories of people's sleep patterns. There is a scientific basis for morning people and night people. And not surprisingly, the factors that go into a person's chronotype are complex and range from genetics to season to stress levels to a person's age. One part I found particularly interesting was the author's examination of the fact that we live in a world of (ideally) 8 hours of continuous sleep followed by 16 hours of being continuously awake. The author shows how this crono-phenomenon is the result of industrialization, electricity, and the modern work force; this has not been the norm for most of our species' existence. I also enjoyed some of the descriptions of different sleep experiments. One of the better books out there on sleep, cronotypes, and our relationship to sleep/time.
Comment Was this review helpful to you? Yes No Sending feedback...
Thank you for your feedback.
Sorry, we failed to record your vote. Please try again
Report abuse

Most Recent Customer Reviews

Set up an Amazon Giveaway

Amazon Giveaway allows you to run promotional giveaways in order to create buzz, reward your audience, and attract new followers and customers. Learn more
Internal Time: Chronotypes, Social Jet Lag, and Why You're So Tired
This item: Internal Time: Chronotypes, Social Jet Lag, and Why You're So Tired
Price: $26.95
Ships from and sold by

Want to discover more products? Check out this page to see more: rhythm circle time