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What TCM Theory Holds Sleep to Be — What "Yang Entering Yin" Means

中医理论怎么理解「睡」：「阳气入阴」是什么意思

In TCM, poor sleep falls under the categories 不寐 and 不得卧. The WHO's standard terminology for TCM describes 不寐 as an inability to obtain normal sleep with drowsiness and low energy during the day, often resulting from emotional disturbances, mental exhaustion and subsequently disharmony between the Ying-nutrients and Wei-defence. The Integrative Medical Centre of the Chinese University of Hong Kong puts it that TCM holds sleep to be a process of yang qi entering yin. This part reads the standard's definitions of yin, yang, yang qi, the waxing and waning of yin and yang, and 营 and 卫 together, to say what "yang entering yin" describes, where the process is held to go wrong, and why none of it is a label to apply to yourself.
「睡不好」在中医里归入「不寐」「不得卧」等范畴。世界卫生组织的中医术语标准对「不寐」的描述是：无法获得正常睡眠，白天困倦、精力不足；常由情志失调、精神疲惫，继而营卫不和所致。香港中文大学中西医结合医务中心的文章说明，中医学认为睡眠是阳气入阴的过程。这一篇把「阳」「阴」「阳气」「阴阳消长」「营」「卫」几个词的标准定义放在一起读，说明「阳气入阴」在理论里描述什么、这个过程会在哪里出问题，以及它为什么不是用来自我对号入座的。
Ms. Bavithaa SufinaOctober 202611 min read11 分钟
Part 2 of 8 in the "how TCM assesses poor sleep" series. The other seven are listed at the foot.

You have heard "yin and yang out of balance" and "yang entering yin", and nobody has said what those words actually refer to. This part fills that in.

Everything below is TCM theory's own account. The definitions come from the World Health Organization's 2022 standard terminology for TCM, and the framework from an article by the Integrative Medical Centre of the Chinese University of Hong Kong. The use of both is specific: they make every sentence here checkable.

The short version

  • In TCM, poor sleep falls under the categories 不寐 and 不得卧 — that is how the Chinese University of Hong Kong article puts it.
  • The WHO standard describes 不寐 as "an inability to obtain normal sleep and drowsiness and low energy during the day", which "often results from emotional disturbances, mental exhaustion and, subsequently, the disharmony between the Ying-nutrients and Wei-defence".
  • The same Chinese University of Hong Kong article holds that sleep is a process of yang qi entering yin, and that sleep problems are a disturbance of that process.
  • "Yang" and "yin" are terms the standard defines. Read together, "yang entering yin" describes the warming, activating, excitatory force of the day withdrawing at night into the side of stillness and dimness. That sentence is our summary of the definitions, not the standard's own wording.

First, the things that cannot wait

You snore with pauses in breathing, or wake up gasping; daytime sleepiness is severe enough to affect driving or work safety — see a doctor for investigation first.

Mood is persistently low, anxiety is hard to control, or you have thoughts of harming yourself — this is not something to wait on. Call 999 now, or go to the nearest hospital emergency department. To talk to someone, the Ministry of Health's Talian HEAL 15555 is open every day from 8 am to 12 midnight, public holidays included; Befrienders KL is open 24 hours on 03-7627 2929. You can also contact your doctor.

The full list, and the reason for each, are in part 8. TCM and Western medicine complement each other; it is not a choice between them.

A note: this section is general information only. For conditions like these, follow your doctor's diagnosis and treatment, and seek medical attention when you need it.

I. First: 不寐 is the name of a category

The Chinese University of Hong Kong's Integrative Medical Centre article writes that insomnia belongs to the TCM categories 不寐 and 不得卧.

The WHO's standard terminology for TCM describes 不寐 as "an inability to obtain normal sleep and drowsiness and low energy during the day", which "often results from emotional disturbances, mental exhaustion and, subsequently, the disharmony between the Ying-nutrients and Wei-defence".

In TCM theory, 不寐 is the name of a category; which situation sits under it is what has to be distinguished. That step comes after the inquiry, not before it — how it is distinguished, and by whom, is part 1.

The same standard has a further term, insomnia (失眠), defined as a "prolonged inability to get sufficient sleep", and notes that its contributing factors "may cause disharmony between yin and yang and subsequently, mental restlessness".

II. Sleep is yang entering yin

The Integrative Medical Centre of the Chinese University of Hong Kong puts it this way: TCM holds that sleep is a process of yang qi entering yin.

By day yang qi is in charge and body and mind are active; at night, yang qi withdraws like the sun, and body and mind rest as sleepiness deepens — that is the same article's wording.

The same article says that sleep problems — difficulty falling asleep, light sleep with easy waking, much dreaming, early waking without getting back to sleep, or waking still tired — are all a disturbance of that process of yang entering yin, leading to yin and yang not meeting and the heart spirit being disturbed.

① So what are "yang" and "yin"? Here the two words are the theory's terms. The WHO standard lists the qualities of yang as "warm/hot, bright, ascending, movement, extroversion" and so on, the qualities of yin as "cold/cool, dimness, descending, stillness, introversion" and so on; the qualities of yang qi include "warming, activating, excitation" and so on.

Read together: "yang entering yin" describes the warming, activating, excitatory force of the day withdrawing at night into the side of stillness and dimness. That sentence is our summary of the definitions above, not the standard's own wording.

The standard has a further term, 阴阳消长 — "dynamic waxing and waning between yin and yang". The paragraph above, yang in charge by day and withdrawing by night, is using that language.

② Where is the process held to go wrong? The same Chinese University of Hong Kong article groups it: an imbalance in the amount or distribution of yang or yin, a lack of coordination in their movement, or obstruction by what the theory calls pathogenic factors (邪气) — phlegm, stasis, damp turbidity, cold, heat and the like.

Its own illustration: if yang qi is overly active, how can it settle to rest as one wishes?

③ "Disharmony of 营 and 卫" is the same thing said differently. The standard's description of 不寐 above ends on that disharmony. 营 and 卫 are the theory's terms too: the WHO standard says 营 (Ying-nutrient) is yin in nature and travels within the vessels, and 卫 (Wei-defence) is yang in nature and travels outside them.

The Chinese University of Hong Kong article, discussing sleep after an illness, joins the two ways of speaking in one clause: disharmony of 营 and 卫, qi and blood — yang not entering yin. In that clause, the two terms point to one process.

💡 Remember: TCM theory sees sleep as yang entering yin. It is a language for understanding, not a chart to match yourself against — the theory's names only land on a particular situation after the inquiry.

The words in this part

All four come from the World Health Organization's 2022 standard terminology for TCM. They are the theory's words, not test results, and not labels to attach to anyone.

  • 不寐 (bú mèi) — the standard's description: an inability to obtain normal sleep and drowsiness and low energy during the day, often resulting from emotional disturbances, mental exhaustion and, subsequently, disharmony between the Ying-nutrients and Wei-defence. It is the name of a category.
  • Yang qi (阳气) — the standard says it is the opposite of yin qi, and that its qualities include warming, activating and excitation.
  • 阴阳消长 (yīn yáng xiāo zhǎng) — dynamic waxing and waning between yin and yang. "Yang in charge by day, withdrawing by night" is that term's language.
  • 营 and 卫 (yíng qì / wèi qì) — the standard says 营 is yin in nature and travels within the vessels, 卫 is yang in nature and travels outside them. "Disharmony between the Ying-nutrients and Wei-defence" is the phrase in the standard's description of 不寐.

Frequently asked

Are 不寐 and 失眠 the same word? In the WHO standard they are two entries. 不寐 is described as an inability to obtain normal sleep, plus drowsiness and low energy during the day; 失眠 is defined as a prolonged inability to get sufficient sleep. Both write the night and the day into the description, and in that they agree.

Do I have "too much yang qi"? That is not a question an article can answer, and not one you should answer for yourself. The theory's names only land on a particular situation after the inquiry — the order is in part 1.

Do not: use the words in this part as labels for yourself, and do not judge your own situation from an "insomnia self-test" graphic online.

The other seven parts

👉 If you are not sure where to begin with your own poor sleep, you are welcome to book an online consultation with HansMed, where a practitioner registered under the T&CM Act 2016 can assess it with you; if anything in "First, the things that cannot wait" above or in part 8 applies, see a doctor first.

Sit with a licensed TCM practitioner from wherever you are.

HansMed Modern TCM

For general wellness education only — not medical advice. Consult a registered TCM practitioner for personal guidance.

Sources

  • World Health Organization, WHO international standard terminologies on traditional Chinese medicine, 2022 (ISBN 978-92-4-004232-2), entries 4, 5, 7, 12, 239, 241, 1589, 2202 — https://www.who.int/publications/i/item/9789240042322
  • Integrative Medical Centre, The Chinese University of Hong Kong, 〈失眠因陽氣難入陰　拆解4大對象人群〉, published 1 January 2024 — https://hkiim.cuhk.edu.hk/imc/tc/press/d/%E5%A4%B1%E7%9C%A0%E5%9B%A0%E9%99%BD%E6%B0%A3%E9%9B%A3%E5%85%A5%E9%99%B0%E3%80%80%E6%8B%86%E8%A7%A34%E5%A4%A7%E5%B0%8D%E8%B1%A1%E4%BA%BA%E7%BE%A4
  • Ministry of Health Malaysia, Hospital Pendang (Kedah State Health Department), Info Kesihatan 2024 — https://jknkedah.moh.gov.my/hpendang/index.php?option=com_sppagebuilder&view=page&id=139
  • Befrienders Kuala Lumpur — https://www.befrienders.org.my/
本文是「睡不好，中医会怎么评估」系列的第 2 篇，共 8 篇。其余七篇列在文末。

听过「阴阳失调」「阳气入阴」，但没人说过那几个字到底指什么——这一篇就补这一段。

以下全部是中医理论的说法。词的定义取自世界卫生组织 2022 年的中医术语标准，理论框架取自香港中文大学中西医结合医务中心的一篇文章。两份资料的用处很具体：它们让每一句都可以查对。

一分钟看完

  • 「睡不好」在中医里归入「不寐」「不得卧」等范畴——这是香港中文大学那篇文章的说法。
  • 世界卫生组织的标准对「不寐」的描述是：无法获得正常睡眠，白天困倦、精力不足；常由情志失调、精神疲惫，继而营卫不和所致。
  • 同一篇香港中文大学的文章说明：中医学认为睡眠是阳气入阴的过程；睡眠问题是这个过程出了问题。
  • 「阳」「阴」是标准里有定义的词。把定义放在一起读，「阳气入阴」描述的是白天那股温煦、推动、兴奋的力量，到了夜里收进静止与晦暗的那一边。这一句是本文依定义作的整理，不是标准的原句。

先说不能等的几件事

睡觉时打鼾伴随呼吸暂停、或被憋醒；白天严重嗜睡，影响驾驶或工作安全——请先就医做检查。

情绪持续低落、焦虑难以控制，或出现伤害自己的念头——这不是可以等的事。请立刻拨打 999，或前往最近的医院急诊部。若想找人谈一谈，卫生部的 Talian HEAL 15555 每天早上 8 时至午夜 12 时开放，包括公共假期；Befrienders KL 24 小时热线：03-7627 2929。您也可以联络您的医生。

完整清单与每一项的理由，见第 8 篇。中医与西医是互相补位的关系，不是二选一。

小提醒：本段仅为一般知识说明。相关情况请以西医的诊断与治疗为主，并在需要时及时就医。

一、先分清楚：「不寐」是一个范畴的名称

香港中文大学中西医结合医务中心的文章写道，失眠归属于中医「不寐」「不得卧」等范畴。

世界卫生组织的中医术语标准对不寐的描述是：无法获得正常睡眠，白天困倦、精力不足；常由情志失调、精神疲惫，继而营卫不和所致。

在中医理论中，「不寐」是一个范畴的名称；它底下是哪一种情况，要分辨。这一步在问诊之后，不在之前——怎么分辨、由谁分辨，在第 1 篇。

同一份标准另有「失眠」一词，定义是：长期无法获得足够的睡眠；标准并指出其相关因素可能造成阴阳失调，继而心神不安。

二、睡，是阳气入阴的过程

香港中文大学中西医结合医务中心的文章这样说明：中医学认为睡眠是阳气入阴的过程。

白天阳气用事，身心活跃；到了晚上，阳气像太阳一样慢慢潜藏，身心随睡意休息——这也是同一篇文章的话。

同一篇文章说，睡眠问题——难入睡、眠浅易醒、多梦、早醒难再睡，或醒来仍觉疲倦——都是阳气入阴的过程出了问题，导致阴阳不交、心神受扰。

① 那么「阳」和「阴」是什么？ 这两个字在这里是理论用词。世界卫生组织的标准把「阳」的性质列为温热、明亮、上升、运动、外向等，「阴」的性质列为寒凉、晦暗、下降、静止、内向等；「阳气」的性质包括温煦、推动、兴奋等。

把两边放在一起读：「阳气入阴」描述的，是白天那股温煦、推动、兴奋的力量，到了夜里收进静止与晦暗的那一边。这一句是本文依上面的定义作的整理，不是标准的原句。

标准另有「阴阳消长」一词——阴阳之间动态的此消彼长。上面那段「白天阳气用事、晚上阳气潜藏」，用的就是这套语言。

② 这个过程会在哪里出问题？ 同一篇香港中文大学的文章分成几类：阳气或阴气一方的多少或分布失衡、两者的运动不协调，或受痰、瘀、湿浊、寒、热等「邪气」——理论里的致病因素——阻碍。

它举的一个例子是：阳气太过活跃，又如何会随心意如愿地休息呢。

③ 「营卫不和」说的是同一件事。 上面标准对「不寐」的描述里，有「营卫不和」四个字。「营」「卫」也是理论用词：世界卫生组织的标准说，营气属阴、行于脉中，卫气属阳、行于脉外。

香港中文大学的那篇文章在谈病后的睡眠时，把两套说法接在一句里：营卫气血不和，阳不入阴。在那句话里，两个词指向同一个过程。

💡 记住：中医理论把睡眠看作阳气入阴的过程。这是一套用来理解的语言，不是一张用来对照自己的表——理论里的名称，要在问诊之后才落到具体哪一种情况上。

这篇出现的几个词

四个词都来自世界卫生组织 2022 年的中医术语标准。它们是理论的词，不是检查项目，也不是贴在谁身上的标签。

  • 不寐（bú mèi）——标准的描述：无法获得正常睡眠，白天困倦、精力不足；常由情志失调、精神疲惫，继而营卫不和所致。它是一个范畴的名称。
  • 阳气（yáng qì）——标准说它与阴气相对，性质包括温煦、推动、兴奋等。
  • 阴阳消长（yīn yáng xiāo zhǎng）——阴阳之间动态的此消彼长。「白天阳气用事、晚上阳气潜藏」用的就是这个词的语言。
  • 营气与卫气（yíng qì / wèi qì）——标准说营气属阴、行于脉中，卫气属阳、行于脉外。「营卫不和」是标准对「不寐」的描述里出现的四个字。

常见问题

「不寐」和「失眠」是同一个词吗？ 在世界卫生组织的标准里是两个词条。「不寐」的描述是无法获得正常睡眠，加上白天困倦、精力不足；「失眠」的定义是长期无法获得足够的睡眠。两条都把夜里和白天一起写进去，这一点是一样的。

我是不是「阳气太盛」？ 这不是文章能回答的问题，也不是您该自己回答的问题。理论里的名称要在问诊之后才落到具体哪一种情况上——顺序在第 1 篇。

不要这样做： 不要拿这一篇的词给自己贴标签，也不要照着网上的「失眠自测图」替自己判断。

这个系列的另外七篇

👉 如果您不确定「我这种睡不好，该从哪里谈起」，欢迎透过汉方中医的线上问诊，由依 2016 年 T&CM 法令注册的医师为您评估；若您有本文「先说不能等的几件事」与第 8 篇列出的情况，请先看医生。

无论身在何处，与持证中医师对坐。

汉方现代中医

本内容仅供健康知识分享，不构成医疗建议。如需个人化建议，请咨询注册中医师。

资料来源

  • 世界卫生组织，WHO international standard terminologies on traditional Chinese medicine，2022（ISBN 978-92-4-004232-2），词条 4、5、7、12、239、241、1589、2202 — https://www.who.int/publications/i/item/9789240042322
  • 香港中文大学中西医结合医务中心〈失眠因阳气难入阴　拆解4大对象人群〉，发布于 2024 年 1 月 1 日 — https://hkiim.cuhk.edu.hk/imc/tc/press/d/%E5%A4%B1%E7%9C%A0%E5%9B%A0%E9%99%BD%E6%B0%A3%E9%9B%A3%E5%85%A5%E9%99%B0%E3%80%80%E6%8B%86%E8%A7%A34%E5%A4%A7%E5%B0%8D%E8%B1%A1%E4%BA%BA%E7%BE%A4
  • 马来西亚卫生部，Hospital Pendang（吉打州卫生局）Info Kesihatan 2024 — https://jknkedah.moh.gov.my/hpendang/index.php?option=com_sppagebuilder&view=page&id=139
  • Befrienders Kuala Lumpur — https://www.befrienders.org.my/
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