Where is this "tendon"?
Stretch out your hand, palm up, on the side of your little thumb on the wrist, wrist horizontal stripe an inch carefully (too fat, thick flesh may not be touchable), you will feel a "tendon".

On the radial edge of this tendon, there is an acupuncture point called Tongli acupoint. Rubbing this acupoint can improve sleep very well.
Why?
Tongli acupoint is the "acupoint" on the hand Shaoyin heart meridian, and it is the "hub" of the hand Shaoyin heart meridian and the hand sun and small intestine meridian. "Li", when the neighborhood, the surface and the inside. Tongli acupoint, which means to communicate the two meridians on the outside and inside, so that the meridian qi is unimpeded.
The heart is yang and is the yang of yang, and it is especially easy to generate false fire and heat evil. Pair it with the small intestine to help the heart "expel fire" by clearing the turbidity of the small intestine. The combination of the heart and the small intestine is a set of natural "fire" devices in our body.
Tongli acupoint is undoubtedly the trigger that activates this set of "fire extinguishing device", which has the effect of clearing the heart fire and calming the hypothermia in the heart. Therefore, this Tongli acupoint has the effect of helping sleep.
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When the heart yin is insufficient, there will be hypothermia. Insomnia, poor sleep, dreaming early or difficulty falling asleep, to name a few, and at the same time the heart is particularly annoying, and the more you can't sleep, the more troublesome you are. At the same time, the hands and feet are hot, thirsty and dry throat, and there may be night sweats, red tongue, or red tongue tip, less tongue coating, and tongue pain. At this time, it is suitable to clear away heat and troubles from Tongli acupoints, and nourish yin and calm the heart.
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When the blood is insufficient, there will also be signs of hypothermia and annoyance. This kind of person has poor sleep quality, insomnia and dreams, or wakes up early, or can only fall asleep once a night, and it is difficult to fall asleep when he wakes up. At the same time, upset, palpitations, forgetfulness, physical tiredness, mental exhaustion. The complexion is a little yellow, and the tongue is pale and pale. This kind of person is also suitable for using Tongli acupoint to calm the nerves and help sleep.
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When phlegm and fire disturb the heart, it will also cause insomnia. Nightmares, easy awakening, restlessness, reduced eating, headaches, red face, red eyes, hot urine, irritable temperament, and a full abdomen. The tongue is red, and the tongue coating is less yellow and greasy. This state is also particularly suitable for using Tongli acupoints to regulate, clear the heart and calm the nerves, and remove troubles and tranquility.
Of course, there are more than these three causes of insomnia, but in general, the use of Tongli acupoints can have the effect of clearing the heart and calming the nerves and removing heat, and it does have a regulating effect on the above-mentioned insomnia. Especially for insomniacs who are upset and red, the effect is better.
Because of this feeling of turmoil in the heart, the ancients called it chagrin, and "Acupuncture Dacheng" said that the owner of this acupoint was "a few days of regret". In "Ma Danyang Tianxing Twelve Acupoints and Miscellaneous Diseases Song", it is proposed that it can regulate and cure "wanting to speak, annoyed and frightened, but in fact, the limbs are heavy, and the head and cheeks are red and ......". and "Jade Dragon Song" also said that it can treat "days of fatigue and facial makeup, and it is difficult to be a ...... with palpitations in my heart".
Therefore, for the Tongli acupoint on this tendon on the wrist, we should indeed rub it more often, 15 minutes on each side every day, until sleep improves.
Some people say, what should I do if I can't find the acupuncture points? It's very easy to do, the four acupuncture points on the wrist are close to each other, you can knead it, you can also use a gua sha board to scrape, scrape the wrist to help sleep, simple and effective!