Why do I wake up at 3am?

Two things are true at once. The second half of the night is lighter sleep for everyone, so whatever is going to wake you will do it after two rather than before. And the tradition has a name for which thing that usually is. It does not ask why you wake at all; it asks what kind of waking it is. Hot and clear-headed, with a thought already running, is one picture. Tired, light and dream-filled is another. Wound tight, with the jaw set and a grievance from the day, is a third.

The plain reasons come first, and they are worth ruling out before any of that: alcohol wearing off around three, a late or heavy meal, a warm room, a full bladder, or a clock you check. Any of them will do it on its own. Once they are out of the way, the hour and the feel of the waking are what the tradition reads.

The Ming-era physicians laid the twelve channels over the twelve two-hour watches of the day, so that each organ had an hour when its qi ran fullest. The scheme is called 子午流注, the flow of qi between midnight and noon, and it is the reason a Chinese physician’s first question about broken sleep is not how long but what time.

Underneath the clock is an older idea. Sleep, in the Lingshu, is the body’s defensive qi leaving the surface and entering the interior for the night. When it cannot get in, the eyes will not close; when it gets in and is pushed back out, they open again.

The Suwen adds the line every physician learns first about sleep and the liver: when a person lies down, blood returns to the liver. A liver with too little blood to receive, or too much heat to receive it quietly, is the tradition’s reading of the one-to-three waking.

The same hour is three different complaints in three different people, and the tongue usually decides which. These are the three we see most across the desk, in the order we see them.

Before anything picture-specific, there is a floor, and it is the same for everyone. The tradition calls it 起居有常, rising and resting with regularity, and it is dull on purpose.

• Finish eating three hours before bed, and make the evening meal the smallest of the day. The stomach and the liver share the night, and a full stomach keeps both awake.
• No alcohol as a sleep aid. It puts you under and then, as it wears off, wakes you — very often at three.
• If you have been awake more than twenty minutes, get up, keep the light low, and do something dull until you are heavy. Lying there teaches the body that three is a waking hour.
• Keep the same rising hour seven days a week, however the night went. The rising hour is the anchor; the bed hour follows it.
• Warm feet. A basin of hot water for ten minutes before bed draws the heat down from the head, which is exactly where the hot-and-clear picture keeps it.

None of that is a promise, and we make none. It is the floor, and most people who wake at three have not yet laid it.

These are foods, not medicines, and each has been on the table for centuries. They lean toward the two commonest pictures.

• Lotus seed 莲子, cooked soft into an evening congee — the Bencao Gangmu says it joins the heart and the kidney, which is the tradition’s phrase for the hot-and-clear waking.
• Jujube 大枣, three or four simmered in water, for the tired-and-light picture.
• Reishi 灵芝, simmered long, for the mind that will not settle.
• Chrysanthemum 菊花 in the evening if you run hot; ginger 生姜 stays in the morning, where it belongs.

Three finger-widths above the inner wrist crease, between the two tendons, is Neiguan, Pericardium 6, 内关, the Inner Gate. It is the point the tradition reaches for when the mind will not come down out of the chest, and it is safe to press in pregnancy, which is why we teach it before any other.

It is pressure with a thumb, not a needle, and it is not a claim about outcomes. Press it for a minute on each side when you wake, slowly, and let the breath lengthen.

Everything above that line is what the tradition says about an ordinary, maddening, common waking. Everything below it is somebody else’s job, and we say so.