Sleeping through the night

The question is not how many hours

When someone writes to us about sleep, the first thing we ask is not how long they sleep. It is when the night goes wrong. Our intake form asks for a clock time, and readers sometimes think that is a formality. It is not. In this tradition the clock time is most of the information.

A person who lies in the dark for ninety minutes at eleven and a person who is entirely awake at three in the morning are describing two different things. So is the person who sleeps eight unbroken hours and gets up feeling as though they had been carrying something all night. Western sleep advice tends to fold all three into one category — insomnia — and then offers all three the same advice about screens and caffeine. Chinese medicine has never grouped them. It sorted sleep by its shape long before it had any way of measuring its depth, and the sorting is the part that still earns its keep.

What follows is the scheme we use when we read an intake, written out in full. It is a way of describing what a person reports. It is not an account of what their body is doing at the level of tissue, and we will say so again in the middle of this essay, because that distinction is the whole reason the scheme is safe to hand to a stranger.

Four shapes of a broken night

Four shapes cover most of what people write to us about. A reader often recognises themselves inside the first two sentences of one of them, and almost as often turns out to be a mixture of two.

You cannot get in

The body is tired and the mind is not. You are warm — often specifically warm in the hands, the feet, the chest. The mouth is dry at bedtime. Ideas arrive with unusual clarity at half past eleven, which is a cruel joke, and the harder you pursue sleep the further off it goes.

The tradition reads this as the yang failing to go in: the active, outward-facing part of the day has not handed over. Where the picture also includes night sweating, a hot flush late in the evening or a persistent dryness, older texts call it 心肾不交 — heart and kidney not communicating — the upper fire and the lower water no longer meeting in the middle. These names are what the tradition calls patterns: descriptions of a whole cluster of reported experience, not names of illnesses.

You wake at three

You go down easily. You surface somewhere between one and four in the morning, fully awake, often with the jaw tight or the mind already halfway through an argument. Sleep returns near dawn, badly, and the alarm arrives in the middle of it.

This is the shape people describe most vividly, and it is the one that made the organ clock famous. Those hours belong to the liver and gallbladder in the twelve-fold scheme below. The traditional reading pairs early-morning waking with heat and with constrained emotion — the irritability that has nowhere to go during the day and turns up at two in the morning instead.

You sleep, and it does not count

Eight hours, unbroken, and you get up as though you had not been to bed. The head feels wrapped. The limbs are heavy. There is often a thick coat on the tongue in the morning and a reluctance to eat breakfast, and the whole picture lifts an hour after you start moving.

The tradition files this under dampness rather than under sleeplessness at all — a fullness that sleep cannot clear because sleep is not what made it. It is the one shape where the useful change is almost entirely to do with the evening meal, which is why it leads straight to food and to the essay on the middle burner.

You dream all night

The night is crowded. You wake several times, each time briefly, each time out of a dream you can still half-see. Sleep is thin rather than short. It often comes with a pale face, a tendency to bruise, and a memory that has become unreliable for small things.

Classical texts describe this as the shen — the spirit, the part of a person that shows in the eyes — not being held. Blood is said to house it at night, and thin blood houses it badly. It is the oldest of the four descriptions and the most metaphorical, and we write it out carefully for exactly that reason.

The organ clock, honestly

The scheme people meet online as the “organ clock” is 子午流注, zǐ wǔ liú zhù, the midnight-to-noon ebb and flow. It divides the day into twelve double-hours and gives each one to an organ network: lung from three to five in the morning, large intestine five to seven, stomach seven to nine, spleen nine to eleven, heart at midday, and on around the circle to gallbladder from eleven at night and liver from one to three.

We want to be plain about what that is. It is not physiology. No one has demonstrated that the liver does anything distinctive between one and three in the morning, and we are not going to imply otherwise in a document someone paid us for. What the scheme is, is a filing system built out of bedside notes. For centuries Chinese physicians wrote down the hour at which people said things happened — when the cough came, when the sweat came, when the eyes opened — and the twelve-fold table is the aggregate of those notes, tidied into a circle.

Read as a mnemonic that organises observation, it is genuinely useful: it gives a clinician a reason to ask what time, and asking what time separates the four shapes above. Read as a mechanism, it is not true. We use the first reading and say so on the page.

What the canon actually says

The written source for all of this is older and plainer than the internet version. The Huangdi Neijing, compiled around 200 BCE in two parts of eighty-one chapters each, describes sleep as a matter of where the defensive qi has gone.

That is the whole model in one sentence: sleep is a movement inward, and anything that keeps a person turned outward at eleven at night interferes with it. The second passage we quote most often is shorter still, and it is the reason a sleep reading so often ends up talking about dinner.

Two thousand years of Chinese physicians have quoted that clause at people who eat late. It is six characters — 胃不和则卧不安 — and it is the single most practical thing in the canon on this subject.

The last two hours

Nearly everything we suggest about sleep lands in the two hours before bed, because that is the window a person actually controls. None of this is exotic, and none of it needs anything you cannot buy in an ordinary shop.

• Finish eating three hours before you lie down. If you are genuinely hungry later, make it small, warm and plain — a few spoonfuls of congee, a cup of warm milk. A cold, raw or heavy plate at ten at night is the one habit that most reliably produces the third shape above.
• Stop drinking iced things in the evening. This is the suggestion Western readers push back on hardest, and it is discussed properly in Eating with the season. Room temperature is enough; nothing has to be hot.
• Soak your feet. 泡脚, pàojiǎo, is ordinary domestic practice across China: a basin of comfortably hot water, filled to just above the ankle bone, ten to fifteen minutes, until the small of the back feels warm. Dry them, put socks on, go to bed. For the person who cannot get in, this does more than any other single change we suggest.
• Take the light down an hour early. The tradition has no theory of melatonin and does not need one; it simply says the lamps come down when the yang goes in.
• Use your hands. Three points you can reach yourself come up again and again in evening routines: Shenmen (HT7) in the crease of the wrist below the little finger, Anmian in the soft spot behind the ear, and Yongquan (KI1) in the hollow that appears on the sole when you curl your toes. Firm, circular pressure for a minute or two on each, enough to feel and not enough to hurt. It is a way of ending the day deliberately as much as anything else.
• Keep paper by the bed. For the three-o’clock waker, writing the sentence down and putting the pen back is worth more than arguing with it in the dark. If you are still awake after twenty minutes, get up, sit somewhere dim, and go back when you are heavy.

We suggest one change at a time and a fortnight to judge it. People who change six things in a week learn nothing, because they cannot tell which one worked.

Where this stops

A reading describes a shape and suggests what to eat, where to press and when to put the light out. That is the whole of what it is. Sleep is also the place where a genuine problem hides most easily behind a traditional description, so we are blunt about the exits.

The rest of the time, sleep responds to unglamorous things: a warmer, earlier dinner, a basin of hot water, a dark room, and the same bedtime for a month. Our grandfather told people to soak their feet for forty years and was right more often than anything else he said. We have kept the habit, and we have kept the basin.