Huanglian Cinnamon can be used in combination to treat insomnia of the heart-kidney disharmony (heart fire and kidney yin deficiency, dysfunction of the physiological functions of the heart and kidneys) type. The formula of Huanglian and Cinnamon is called Jiaotai Pill, whose effect is to communicate with the heart and kidneys (heart fire descends, kidney water rises, and mutual control). It can be used to treat the symptoms of water not helping fire and heart fire being over-excited, such as restlessness and sleeplessness at night. In the formula, Huanglian is bitter and cold, mainly into the heart meridian, good diarrhea of the heart fire in order to thwart the heat, intended to clear the heart to lower the fire in addition to the annoyance, so it is the king’s medicine. Cinnamon is pungent, sweet and hot, and mainly enters the kidney meridian to draw fire back to the source (to inhibit the fire of the kidneys from rising), the dosage of one-tenth of Huanglian, on the one hand, to restrain Huanglian from injuring yang with bitter and cold, on the other hand, it does not help the fire of the evils of the anti-support, and draws the meridian of the intention. The two drugs are clear and warm, but the heart and kidneys are intertwined, and the water and fire are in harmony, so the heart and spirit are at peace, and sleeplessness is eliminated. The above drugs need to be used under the guidance of a doctor.