Sleep posture is a natural body posture. It can relieve muscle fatigue, reduce body energy consumption, and help operators adopt more stable postures to perform various delicate tasks. However, long-term poor sleep posture can have many disadvantages for human health, such as leading to lumbar muscle strain, spinal changes, poor blood circulation, etc. Therefore, a good soft bed & mattress design needs to consider the static and dynamic dimensions of the human body comprehensively and provide good support and guidance to users in different sleep postures.