Japanese sleeping mats, also known as futons, are traditional bedding used in Japan for centuries. They are made up of several layers of fabric and padding, providing comfort and insulation from cold floors. There are two main types: traditional futons made from thick cotton batting and modern futons with foam cores. Benefits include increased comfort, better insulation, and taking up less space than regular mattresses. They can be purchased online or at specialty stores, in single or double sizes.