Huang Tingjian, a writer in the Song Dynasty, said in a poem: "The pillow is used to bend the humerus, and I would like to sleep and listen to Fenfen." Old eyes are willing to be idle, and reading is really a hobby. The poet praised Cassia seed pillow for its functions of clearing away heat, calming nerves, improving eyesight and helping sleep. The Tang Dynasty's "Daming Materia Medica" said: "As a pillow, it is better than black beans to cure the head wind and improve eyesight. "The medicated pillow made of cassia seed mixed with chrysanthemum is one of the external treatments of traditional Chinese medicine, which is moderate in hardness and good for the head. A bag of medicine pillow can accompany people to sleep and sleep happily.