Modern people divide the day into 24 hours and are accustomed to using hours and minutes to schedule work, meetings, meals, and sleep.

In traditional Chinese temporal culture, a day can also be divided into twelve "shichen" (double-hours): Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, and Hai, with each shichen corresponding to approximately two hours in modern time.

In traditional Chinese medicine (TCM) theory, these twelve shichen are linked to the twelve meridians: the Gallbladder Meridian during the Zi hour, the Liver Meridian during the Chou hour, the Lung Meridian during the Yin hour, the Large Intestine Meridian during the Mao hour... all the way to the Sanjiao (Triple Burner) Meridian during the Hai hour.

This is the traditional wisdom of living often referred to today as "Twelve-Shichen Health Preservation" or "Ziwu Liuzhu (Midday-Midnight Ebb and Flow) Health Preservation."

What makes it truly worthy of reference for modern people is not the mechanical division of a day into twelve rigid rules, but the reminder that: Human life also has its own rhythm—sleep when it is time to sleep, eat when it is time to eat, move when it is time to move, and be still when it is time to be still.

When life regains its rhythm, we re-establish our connection with time, our bodies, and nature.

I. What are the Twelve Shichen?

The ancients divided a day into twelve shichen, each equivalent to two modern hours.

The twelve shichen are:

Traditional meridian theory holds that there is a correspondence between the flow of human Qi and blood and time. The twelve meridians correspond to the twelve shichen in sequence, forming a daily cycle that moves from rest at night to waking, eating, activity, and finally returning to rest.

From the perspective of today's lifestyle, it also provides us with a "24-hour rhythmic map of life" with a distinctly Eastern character.

II. Health Guidelines for the Twelve Shichen and Zang-Fu Meridians

Zi | 23:00–01:00 | Gallbladder Meridian in Command

The end of one day is the beginning of a new rhythm

The Zi hour is a crucial juncture for the transition between Yin and Yang in a day.

Traditional theory links this period to the Foot Shaoyang Gallbladder Meridian, which belongs to the Wood element.

The ancients emphasized that nighttime should be a period of stillness and introspection. For modern people, this is especially worth noting—rather than searching for complex "secret remedies for health," it is better to start by cutting back on late-night phone scrolling, midnight snacks, and chronic sleep deprivation.

Lifestyle Suggestions for the Zi Hour

Recommended:

• Try to fall asleep
• Dim the lights
• Put down your phone and computer
• Keep the bedroom quiet

Avoid:

• Working late into the night
• Midnight snacks
• Heavy drinking
• Using electronic screens for long periods before sleep

Keyword for Zi hour health: Sleep.

Chou | 01:00–03:00 | Liver Meridian in Command

Stillness at night to ensure a good sleep

The Chou hour corresponds to the Foot Jueyin Liver Meridian, which also belongs to the Wood element.

Traditional Chinese medicine has the saying, "When a person lies down, blood returns to the liver," which is why the ancients placed great importance on restful sleep during this phase.

In modern life, it is not uncommon for people to be working, socializing, or drinking until 1:00 or 2:00 AM. Regardless of whether one understands it through traditional meridian theory, chronic sleep deprivation will disrupt one's normal life rhythm.

Lifestyle Suggestions for the Chou Hour

There is only one simple method: get a good night's sleep.

Try to minimize late-night work, drinking, and intense emotional stimulation, letting the night truly be a time for the body and mind to rest.

Keyword for Chou hour health: Stillness.

Yin | 03:00–05:00 | Lung Meridian in Command

Stay warm and let the body continue to rest

The Yin hour corresponds to the Hand Taiyin Lung Meridian, which belongs to the Metal element.

Traditional theory suggests that the "lungs govern all meridians" and hold significance in the movement of the body’s vital energy.

However, for the vast majority of modern people, the best thing to do between 3:00 and 5:00 AM is still not morning exercise, but to remain in a deep sleep. If you happen to wake up, keep your body relaxed and breathe slowly; there is no need to rush to get up and be active.

Lifestyle Suggestions for the Yin Hour

• Maintain a deep sleep
• Ensure warmth at night
• Breathe slowly and relax the body if you wake up
• No need to perform intense morning exercise

Keyword for Yin hour health: Rest.

Mao | 05:00–07:00 | Large Intestine Meridian in Command

Modern people can interpret this shichen as the "startup phase" of the day.

What to do upon waking?

• Drink a glass of warm water
• Open windows for ventilation
• Do a few minutes of gentle stretching
• Use the restroom if you feel the urge
• Give your body a buffer period to transition from sleep to wakefulness

There is no need to pursue complex morning rituals.

Regularity itself is a form of health preservation.

Chen | 07:00–09:00 | Stomach Meridian in Command

Consider a balance of: high-quality protein + whole grains/complex carbohydrates + fruits and vegetables.

For example:

• Egg + whole-wheat bread + fruit
• Millet porridge + egg + vegetables
• Oats + nuts + fruit

More important than which specific "stomach-nourishing food" you eat is establishing a regular, moderate dietary habit.

VII. Si | 09:00–11:00

Spleen Meridian in Command: Focus on work, but don't forget to move your body

The Si hour corresponds to the Foot Taiyin Spleen Meridian, which belongs to the Earth element.

In traditional Chinese medicine theory, the "spleen governs transformation and transportation," relating to the digestion and distribution of nutrients.

After breakfast, many people enter the most concentrated stage of work and study for the day.

Therefore, this shichen can be utilized as your "deep work time."

Lifestyle Suggestions for the Si Hour

• Schedule tasks requiring focus
• Maintain a correct posture
• Get up and move around periodically
• Stay properly hydrated

If you need tea, choose warm water or milder beverages according to personal preference.

Keyword for Si hour: Focus.

Wu | 11:00–13:00 | Heart Meridian in Command

Even in the middle of the day, you need a moment of quiet

The Wu hour corresponds to the Hand Shaoyin Heart Meridian, which belongs to the Fire element.

"Wu" (noon) is also one of the key junctures for the transition between Yin and Yang in traditional temporal philosophy.

After a busy morning, instead of continuing at high speed, give your body and mind a brief buffer.

Midday Suggestions

• Keep lunch moderate
• Take a light walk after eating
• Rest for 15–30 minutes if conditions permit
• Close your eyes and collect your thoughts
• Practice a few minutes of slow breathing

"Nourishing the heart" here does not necessarily mean complex meditation.

Sometimes, it is enough to simply stop the information input for ten minutes and let yourself be quiet.

Wei | 13:00–15:00 | Small Intestine Meridian in Command

Be leisurely after meals, avoid excessive snacking

The Wei hour corresponds to the Hand Taiyang Small Intestine Meridian, which belongs to the Fire element.

Traditional theory describes the function of the small intestine as "separating the clear from the turbid."

After lunch, the pace of life can be moderately slowed down.

Lifestyle Suggestions for the Wei Hour

You can schedule:

• Routine tasks
• Communication and collaboration
• Organizing work
• Light walking
• Normal hydration

If lunch was sufficient, there is no need to rely on high-sugar snacks just because you feel drowsy in the afternoon.

Shen | 15:00–17:00 | Bladder Meridian in Command

Keep active, and don't forget to hydrate

The Shen hour corresponds to the Foot Taiyang Bladder Meridian, which belongs to the Water element.

By the afternoon, those who have been sitting for a long day especially need to stand up and get moving.

Traditional twelve-shichen guides usually emphasize the metabolism of fluids during this stage, which can be turned into a very practical modern habit: remember to drink water and remember to leave your chair.

You can:

• Proactively drink water
• Stand up and walk
• Stretch your shoulders, neck, and lower back
• Arrange moderate exercise according to personal habit

You | 17:00–19:00 | Kidney Meridian in Command

Gradually returning to yourself from the busyness

The You hour corresponds to the Foot Shaoyin Kidney Meridian, which belongs to the Water element.

In the traditional Chinese medicine system, the "kidneys store essence," which is why this stage emphasizes contraction and conservation.

Applied to modern life, this is a very suitable time to transition between work and private life.

Lifestyle Suggestions for the You Hour

• End high-intensity work
• Take a stroll
• Moderate relaxation
• Have a moderate dinner

Why not leave the anxieties of the workday back at the office?

Keyword for You hour: Conservation.

Xu | 19:00–21:00 | Pericardium Meridian in Command

Return the night to your life

The Xu hour corresponds to the Hand Jueyin Pericardium Meridian, which is associated with Ministerial Fire in the traditional five-element system.

The ancients valued peace of mind, whereas one of the biggest problems for modern people at night is exactly this: the body has arrived home, but the brain has yet to get off work.

After 7:00 PM, you can consciously lower the "stimulus level" of your life.

Suitable activities:

• Spending time with family
• Reading
• Listening to music
• Soaking feet in warm water
• Strolling
• Reducing work-related information

Also, avoid late caffeine intake and overly greasy foods.

Hai | 21:00–23:00 | Sanjiao Meridian in Command

Leave a buffer for sleep

The Hai hour corresponds to the Hand Shaoyang Sanjiao (Triple Burner) Meridian, associated with Ministerial Fire.

The "Sanjiao" in traditional Chinese medicine is not a single organ in the modern anatomical sense, but a functional concept unique to Chinese medicine, related to the body's vital energy and fluid circulation.

From a lifestyle perspective, the most important thing during the Hai hour is: preparing for sleep.

Establish your own pre-sleep ritual:

• Dim the indoor lights
• Wash up
• Practice abdominal breathing
• Simple meditation
• Read a physical book
• Reduce electronic screen time

Repeating a similar bedtime routine every day tells your body: today is over.

Then you enter the Zi hour, and the day begins anew.

What do the Twelve Shichen truly tell us?

If you reduce the Twelve-Shichen health regimen to "you must take care of a certain organ at a certain time," you will easily lose the truly valuable part of this traditional temporal wisdom.

The Twelve Shichen offer a view of time that is completely different from modern efficiency-ism. It reminds us that time is not just for productivity. A day should include: waking up, eating, working, activity, rest, companionship, and sleep.

There is relaxation with tension, and movement with stillness. This is the Yin-Yang rhythm emphasized by traditional Chinese culture.

How can modern people practice the Twelve-Shichen health regimen?

In truth, you don't need to post a chart on the wall and remind yourself to "nourish an organ" every two hours. You can start practicing today with just a few simple things:

Morning—Slow down, give your body enough time to wake up.

Breakfast—Be serious, don't let coffee replace breakfast long-term.

Daytime—Move a bit, avoid sitting for long periods.

Midday—Be quiet, give your brain ten or twenty minutes to rest.

Evening—Taper off, gradually end the day's high-intensity work.

Night—Dim the lights, reduce light and electronic screen stimulation.

Late night—Sleep, don't use up tomorrow by staying up late today.

This may be the best way for modern people to open the door to Twelve-Shichen health preservation.

Following the rhythm of time is a wisdom of living.

From the Zi hour to the Hai hour, the twelve shichen form a complete cycle for the day.

By observing the heavens, day and night, and the human body, the ancients established a unique philosophy of time. Today, we don't have to arrange every minute of our lives strictly according to ancient lifestyles.

However, the Twelve Shichen can still remind us: there is a time for living, and a regularity for daily routine; balance movement and stillness to find true ease.

True health preservation is not about constantly adding new rules. It is simply learning to re-recognize:

When to work diligently,

When to eat properly,

When to put down the phone,

And—when it is time to sleep.

Further Reading

The Origin of the 24 Solar Terms
Learn how the Chinese established the seasonal time system through solar movement.

Seasonal Health: A Lifestyle in Sync with Nature
Understand the traditional wisdom of living through the cycles of spring birth, summer growth, autumn harvest, and winter storage.

What are the Heavenly Stems and Earthly Branches?
Understand the Chinese temporal culture behind the Twelve Earthly Branches and the Twelve Shichen.

Free Online Perpetual Calendar
Look up traditional calendars, solar terms, stem-branch data, and date information.