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daily rhythm
daily rhythm
Description
Book Introduction
Recommended by major local media outlets immediately after publication!
A joint study by the Netherlands' leading neuroscientists and chronobiologists!
The health keyword that first drew attention from the Nobel Prize in Medicine, 'circadian rhythm'
Uncover the secrets that will transform your life and health.

Purunsup Publishing published “Daily Rhythm,” which helps people find their own circadian rhythm and overcome fatigue and illness in daily life.
Authors studying chronobiology and sleep science say that our day, including sleep, health, exercise, and performance, is determined by our biological clock, based on the Nobel Prize-winning theory of circadian rhythms.

This means that when you sleep, when you perform best, when you feel hungry and when your body can best process food are all determined by your biological clock.
Therefore, it is argued that if you can know your own biological clock, you can live a healthier and more fulfilling life.
And this biological clock is like a 'clock with a thousand hands'.
This is because our brain has a 'master clock' and the organs and cells throughout our body also have small clocks that create biological rhythms.
The authors show how to use these sophisticated and complex clocks to restore health and improve performance.

In modern society, there are many reasons why our biological rhythms differ from our actual lives, such as working nights, commuting to and from work, or using artificial light late at night.
However, in order to live a healthy life, it is important to maintain lifestyle habits that are in line with the rhythm of the biological clock.
If your health has deteriorated, you can recover your health by resetting your biological rhythm and biological clock.

This book explains where our internal biological clocks come from and how our daily lives disrupt them.
It shows scenes where circadian rhythms are disrupted throughout the day, explains how the circadian clock affects our daily lives, and provides examples and methods for a healthier life.

In particular, it presents the role of the biological clock in each area, such as sleep, exercise, eating, and disease.
In particular, it details how the misalignment between the biological clock and daily routine affects health, providing readers who want to know more about the relationship between the biological clock and health with specific methods and information on what to do for their health and performance.

One of the key concepts is the concept of ‘social jet lag (micro-jet lag)’.
For example, it explains the impact of the lifestyle habit of most modern people, which is to make up for the lack of sleep during the week by sleeping in on the weekends.
It also addresses the health problems faced by night shift workers and provides tips for living a healthier life without experiencing circadian syndrome.
If you can read your internal clock, you can regain lost health and achieve lost accomplishments.
Now is the time to listen to the alarms your own biological clock sends!
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index
Introduction: Morning People and Night People

The biological clock with the alarm turned off

How to adjust your biological clock

Listen to your biological clock

Nobel Prize-winning chronobiologists

A clock with a thousand hands

Part 1: All About Your Biological Clock

biological time

From blue-green algae to humans

Mimosas have rhythm too

cave experiment

How does the biological clock work?

Where the biological clock is

The suprachiasmatic nucleus, the conductor of biological rhythms

Find the clock gene

Why a watch?

Set the clock

Inaccuracy and synchronization

Morning sunlight setting the clock

Rhythm not influenced by light

What good light has

Zeitgeber

Part 2: A Perfect Day

AM0:00 - 6:00 Sleep

Sleep is not a black box.

Deep sleep is not good

Optimal sleep time

Day and night of the biological clock

The correlation between melatonin and cortisol

What is a 'normal' sleep pattern?

owl or early bird

The Wisdom of Camping

Naps, siestas, and power naps

Rules for Healthy Sleep

Tips for a good night's sleep

6:00 AM - 12:00 PM Meal

The four stages of energy metabolism

Hunger felt by the brain

Peripheral clocks within the organs

Hormonal rhythms throughout the day

craving for a late-night snack

24-hour rhythm of the gut microbiota

Meal Times for Weight Loss

Why You Should Cut Down on Dinner

Eat less when you eat breakfast

Breakfast and dinner meals

Breakfast in a bright place

Intermittent fasting using the biological clock

Tips for a Healthy Eating Clock

PM12:00 - 18:00 Performance

Run in the evening rather than in the morning

The correlation between medals and biological clocks

Work during the day, exercise in the evening

The Best Exercise Schedule for Your Health

Adapt to the optimal exercise time

The Trap of the 'Wrong' Time Zone

Biorhythms of fine motor skills

The brain rhythm that produces results

Feeling your biological clock

The time when you achieve your best academic performance

The biological clock that causes morning blues

Using circadian rhythms at work

Eventually, an accident occurs

Tips for achieving peak performance

PM6:00 PM - 12:00 AM Disease and Health

The rhythm of the immune system

A feverish night

Respiratory Health in the Midnight

midnight allergies

Get vaccinated in the morning!

Wound care and sunbathing in the morning too!

Visit the dentist in the afternoon!

Heart attack in the morning

I'm scared of the night

Circadian rhythms that regulate pain

Health Tips Using Your Biological Clock

Part 3: Circadian Syndrome

unsynchronized clocks

jet lag syndrome

Why is jet lag so hard to adjust to?

Adjusting Your Body Clock While Traveling

Pre-flight acclimatization period

Will melatonin help?

Monday blues is also jet lag.

Preventing Social Jet Lag

Things to do after vacation

Tips for Overcoming Jet Lag

Daylight saving time

12 o'clock, not actually 12 o'clock

Sleep according to the sundial

The problem that only takes an hour

Is it summer time or winter time?

Tips for Coping When Your Circadian Rhythm Changes

night shift

A Look Inside the Night Shift

The occurrence of extreme discrepancies

How to minimize circadian rhythm misalignment

Adjusting Your Circadian Rhythm: Should You Do It or Not?

Shift work order and biological rhythms

Light of the Night

The Best Sleep Method for Night Shift Workers

Midnight Power Nap

Sleeping while the world is awake

Night shift workers' diet and exercise

Tips for Coping with Night Shifts

Circadian rhythm sleep-wake disorder

Repeated oversleeping

Treating DSPD

If a day had 23 hours

Sometimes morning type, sometimes evening type

Why Nursing Homes Need to Be Bright

Tips for Sleep-Wake Rhythm Disorders

Growth and Aging of the Biological Clock

Fetal biological clock

Baby's biological clock

Birds that wake up in the morning

Lazy teenagers?

Finally becoming an adult

The biological clock entering retirement

Differences in the biological clocks of women and men

Slow Aging of the Biological Clock and Parenting Tips

Biological Clock and Disease

Correlation with cancer

How to Prevent Cancer with a Balanced Rhythm

The Impact of Your Biological Clock on Mental Health

Autism Spectrum and ADHD

melancholia

Anxiety disorders and schizophrenia

Neurological diseases such as Alzheimer's and Parkinson's disease

stress

circadian stress

But what time is my biological clock now?

Conclusion

Acknowledgements

References

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Into the book
This clock with a thousand hands is essential to our lives.
Of course, the clock doesn't always work properly and can be very out of sync at some points.
Even so, it doesn't mean it's completely broken.
After reading this book, anyone with a knowledge of the biological clock will be able to better listen to their own biological clock alarms.
A biological clock that operates smoothly in daily life in this way is the foundation for living a happy life.
--- p.14 From “Introductory Remarks”

In this way, the biological clock is an inseparable part of living organisms and is very important for both survival and life success.
Therefore, there are plenty of reasons to know how the biological clock works.
--- p.28 From “Biological Time”

Following a single rhythm throughout the day has clear benefits for both plants and animals.
The harmony of these rhythms is ultimately essential for the survival of all species!
--- pp.33-34 From “Mimosa Has Rhythm Too”

Clocks located throughout our body direct the functioning of our organs according to circadian rhythms.
This is the basis of all rhythms that create the human body and all its actions.
Our bodies function thanks to the thousands, even tens of thousands, of clocks within them, and if these clocks are out of sync with each other, our bodies can get a little chaotic.
Of course, there is a solution to govern all these clocks.
--- p.44 From “The conductor of biological rhythms, the suprachiasmatic nucleus”

It is very important to synchronize our body's biological clock with the time of the outside world.
This is because it allows our bodies to adapt perfectly to predictable changes.
For example, waking up from sleep, digesting food properly during meal times, and ensuring that the brain and muscles perform optimally when thinking or moving.
This way, we can do the right things at the right times, which not only keeps us healthy but also gives us a better chance of success.
--- p.56 From “Inaccuracy and Synchronization”

If you get enough light during the day, you can fall asleep naturally at night without suffering from insomnia.
It is very important to be aware of the impact light has on our biological clock and our sleep.
Here, good quality light means light that satisfies brightness, color, and timing.
--- p.66 From “What Good Light Has”

As you pay off your sleep debt, the lighter sleep of non-REM sleep follows.
This first process is called 'sleep debt' or 'process S', an acronym for 'sleep need'.
The second process is called 'Process C', taking the first letters of 'cycle'.
And this process is controlled by the biological clock.
Your body clock determines the optimal time to go to sleep and wake up in a 24-hour cycle.
--- p.95 From “Optimal Sleep Time”

In humans, there is a circadian rhythm in insulin, cortisol, and blood sugar.
For example, every morning, just before we wake up, our bodies experience a rise in cortisol and blood sugar levels.
This happens even before breakfast, due to the influence of the biological clock.
--- p.128 From “Hormonal Rhythms Throughout the Day”

However, there are research results that show that exercising in the evening increases free fatty acid in the blood, which is evidence that fat burning occurs.
The tricky thing is that fat burning is linked to nutrition.
--- p.164 From “The Optimal Exercise Schedule for Health”

High blood pressure is a risk factor that can lead to several serious diseases.
Stroke, including cerebral hemorrhage and cerebral infarction, and heart attack are caused by high blood pressure.
Of course, other factors are at play, but often the combination of changes in blood pressure due to the body's biological clock and morning activity is the final "hit" that actually causes a heart attack.
--- p.206 From “Heart Attack in the Morning”

Social jet lag occurs practically twice a week.
When Saturday comes, we start to gradually turn back the clock, and when Monday comes, we suddenly pull it forward.
In many cases, especially for young people or students who are true night owls, time tolerance varies from person to person.
… … This puts a heavy burden on the biological clock and affects health.
--- p.236 From “Monday blues is also jet lag”

If you've already worked an all-nighter, meaning you need to sleep during breaks between shifts, it might be more convenient to split your sleep into a few hours in the morning and a few hours in the evening.
This way, you will have less sleep inertia when you wake up and will be able to stay awake relatively more easily at night.
--- p.278 From “The Best Sleep Method for Night Workers”

Considering all the information previously mentioned about the correlation between circadian rhythms and tumor growth, it is likely that maintaining a good rhythm can be very helpful in slowing the growth of (certain types of) cancer.
Additionally, some cancers are treated using fasting therapy.
The stronger the circadian rhythm, the more effective cancer treatments such as chemotherapy are, as the strong rhythm of clock genes and clock proteins helps attack cancer cells.
--- p.341 From “How to Prevent Cancer with a Balanced Rhythm”

Publisher's Review
Circadian rhythm and biological clock,
Beyond a mere trend, it has become a steady keyword for health.


Recently, a new term called “chrono walking”, coined by British journalist Ellen Scott, has become popular in Australia.
According to one article, “Chronoworking, which allows workers to choose their own work hours when they are most productive rather than working at fixed hours set by the company,” “has seen a 600% increase in Google searches this year compared to the previous year.”
This means that many people agree on the benefits of working according to their own circadian rhythm.
This isn't just a story limited to the workplace.
Interest in daily routines tailored to an individual's biological clock is growing worldwide.

In this way, topics related to circadian rhythms and biological clocks have been receiving more attention recently.
In 2017, three American scientists won the Nobel Prize in Medicine for their work on chronobiology.
The Nobel Committee emphasized the importance of the biological clock, stating that their discovery explains why the Earth's rotation and the unique biological rhythms of living things are synchronized.
A YouTube video discussing the biological clock has been viewed 1.39 million times, proving just how much interest people have in circadian rhythms.

This reveals the public's desire to know more specific and substantive information than simply going to bed early and waking up early to relieve fatigue.
This is because the demand for wellness information, including 'slow aging', has rapidly increased, and the number of people trying to take care of their health in their daily lives has increased significantly.
The beauty of circadian rhythms is that you don't have to spend a lot of money on health; you can achieve big results just by changing small habits in your daily life.

The authors of this book also say that “because the biological clock is connected to everything,” “no matter what you study or do, you will find that the results are different in the morning, afternoon, evening, or night.”
In this way, all of our future activities will have to be interpreted from the perspective of the biological clock.

Morning and evening runs
What would be better?


Is there really a correlation between specific periods and health? Our bodies are maintained in accordance with specific cycles.
We all know that certain times of day are linked to certain bodily reactions, such as a high fever at night or worsening allergies.
But this is only a glimpse.
Because we are governed by our biological clocks in more ways than one.
Our body is like a giant clock with a thousand hands, made up of organs that move according to their own time zones.
From the perspective that the movements of these organs have a rhythm, it becomes clear that solving problems our bodies face and achieving better performance ultimately depends on our "daily rhythm."

The same goes for exercise, including running.
According to this book, our bodies are influenced by a biological clock, so there are specific times when we can function optimally.
“Because if it is not the right time for your biological clock, you cannot function properly and achieve results.”
Oxygen, energy, body temperature, hormones, and mitochondria, which play a role in muscle function, have a rhythm that peaks and troughs in a 24-hour cycle.
Therefore, the time when muscle activity is optimized and reaches its peak is already set.
Studies show that most people find that the late afternoon is a good time to activate their muscles.

For example, in tennis, serve speed is higher in the early evening (6 p.m.) than in the morning (9 a.m.).
But in the morning, the accuracy is higher.
In the evening, you may hit the ball harder, but the tennis ball or shuttlecock may bounce faster.
One sport that prioritizes accuracy over strength or reaction time is archery, and in this sport, late morning is much better than evening.

From morning fatigue to incurable diseases,
"Daily Rhythm": Solving the Problems Caused by "Microjet Disparity"


《Daily Rhythm》 is a book written by leading Dutch scientists to explain the results of their joint research on biological clocks to the general public.
First, we will introduce the scientific research results on the biological clock, and then we will examine how the biological clock actually works by following the daily trajectory of life.
In the process, we comprehensively examine the various health and work-related problems caused by 'jet lag', which occurs when the body's biological clock is out of sync with the external time.
Using rich, specific medical research and clinical examples, it demonstrates that these problems are not simply day-to-day disruptions, but rather macroscopic, life-long issues.

For example, if you go to bed late, it is natural to wake up late the next day.
This problem doesn't stop with oversleeping that day, but accumulates into 'micro-jet lag', pushing back the time of going to bed.
If that happens, our rhythm will be disrupted, and we will inevitably experience fatigue and health problems.
This book suggests solutions such as synchronizing your body clock by getting as much natural light as possible in the morning to adjust your sleep schedule.
Alternatively, if you work night shifts, it's suggested that taking "power naps," short naps that don't affect your circadian rhythm, can also help maintain your sleep rhythm.

'Social jet lag' is an inevitable occurrence every day.
Unlike the time difference that occurs when traveling abroad, the authors' argument throughout this book is that although there is only a 'few minutes' difference between our daily routines and our biological clocks, if this accumulates, it can ultimately have a significant impact on our health and daily lives.
And to solve this, we present specific solutions that can be applied directly to everyday life.
In particular, in parts 2 and 3, which talk about how to utilize your biological clock depending on the time zone and situation, “Tips for utilizing your biological clock” is included as a separate page at the end of each chapter to emphasize the solution once more so that you can intuitively check it.

The clocks inside my body come together to form the rhythm that makes up my day.
If you follow this 'daily rhythm' well, you will be able to naturally reduce 'micro-jet lag' and lead a healthier and more energetic daily life.
GOODS SPECIFICS
- Date of issue: October 27, 2025
- Page count, weight, size: 384 pages | 596g | 145*215*26mm
- ISBN13: 9791172540791

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