South Korea. Koreans also value the use of natural materials in their bedding, such as cotton, silk, and wool. They have unique sleeping habits, including the use of heated floors and firm pillows made of buckwheat or rice husks. Bedding stores in South Korea offer a wide variety of options for those looking to find the perfect bed for their needs. Overall, sleep is taken very seriously in South Korea, and they have developed many habits to ensure a good night's rest.