What role does buckwheat husk play in pillows?

According to Compendium of Materia Medica, buckwheat shells are sweet, cold-resistant and non-toxic. When the skin is used as a pillow, it can improve vision, produce far infrared rays that are most suitable for human body to absorb, accelerate the blood flow of head microcirculation, effectively improve the blood supply and oxygen supply to the brain, and activate brain cells, thus regulating the excitement and inhibition of the nervous system, calming the nerves and helping sleep. Made of pure cotton coarse cloth and pure natural buckwheat shell, it is made by strict screening, washing and sterilization. Moisture-proof and breathable, warm in winter and cool in summer, suitable for use all year round. Buckwheat pillow has the function of promoting sleep and is the best choice to treat insomnia and sleep difficulties.