The TCM body clock

This traditional theory says qi and blood flow through the twelve meridians in sequence, two hours each. 11pm–3am belongs to the gallbladder and liver, one reason TCM stresses an early night.

How the twelve periods line up

The ancient day was divided into twelve two-hour periods. In the body clock theory, 11pm–1am is the gallbladder channel, 1am–3am the liver, 3am–5am the lungs, 5am–7am the large intestine, 7am–9am the stomach and 9am–11am the spleen.

From 11am–1pm it is the heart, 1pm–3pm the small intestine, 3pm–5pm the bladder, 5pm–7pm the kidneys, 7pm–9pm the pericardium and 9pm–11pm the "triple burner", a TCM term for the body's overall fluid and energy pathways.

There is no need to memorise them all. A few periods that matter for daily life are enough: breakfast in the morning, a short rest at midday, winding down at night.

How to use it

Treat it as a gentle routine prompt: regular breakfast, a short rest after lunch, winding down at night. It is not a scientifically proven body schedule.

In practice: start the day with a glass of warm water, and have breakfast between 7 and 9am, the stomach's period, traditionally seen as a good time to digest. After lunch, if you can, close your eyes for ten to twenty minutes; the afternoon usually feels better for it. After 9pm, dim the lights and put work away so the body can slow down.

A simple bedtime routine

Put a few small steps together and you have a bedtime habit. Put your phone down an hour before bed. Soak your feet in warm water or take a warm shower. Press Shenmen (HT7) on the wrist and Anmian behind the ear for about a minute each. Finally, rub Yongquan (KI1) on the sole of each foot with your palm until it feels warm.

If you want a late snack, a small bowl of lotus seed and lily bulb sweet soup with little sugar beats fried or strongly flavoured food. Lotus seeds are binding, so keep portions moderate if you are constipated; lily bulb is cooling, so go easy if your digestion runs cold. For more on each one, see the Related acupoints and Related ingredients sections below.

The Hong Kong reality

Many people in Hong Kong work shifts or overtime, or eat dinner at 8 or 9pm, and can't follow the clock closely. That is no reason to give up; just find the parts you can do. If dinner is late, make it smaller and lighter. If you work nights, sleep afterwards somewhere dark and quiet, and keep your sleep times consistent.

Regularity matters most. Even if your schedule doesn't match the clock, sleeping and eating at roughly the same times every day helps your body adapt.

A common misunderstanding: waking at 3am means a liver problem?

A popular claim online is that waking during a particular period means the matching organ is in trouble. That stretches the traditional theory well beyond what it says, and no scientific evidence supports it. Waking at night has many possible causes, including stress, room temperature, alcohol, caffeine, needing the toilet or sleep apnoea.

If poor sleep or night waking goes on for weeks and affects your days, talk to a healthcare professional rather than matching yourself to a time slot.