Sleeping on the ground has been a long-standing tradition in Japan, dating back centuries to the Jomon Period. The Japanese believe that sleeping on a firm surface such as tatami mats or futons can improve posture, alleviate back pain, promote better blood circulation, reduce snoring, regulate body temperature and provide a sense of grounding and stability. Sleeping close to nature is seen as part of their national identity and rooted in the Japanese philosophy of simplicity and minimalism. While some modern adaptations have emerged, sleeping on the ground may not be for everyone and requires a firm surface and adequate support for the spine and neck.