It is the purpose of this report to inform you the general state of the research of Japanese bed from the viewpoints of health. 1) The course of time in microclimate inside of the bed and skin temperatures distribution in sleep adequate to keep comfortable sleep were determined. 2) The weight distribution of mattresses and bedclothes which are being used at various places in Japan, were investigated. 3) Physical properties of nonhygroscopic mattresses and bedclothes which were developed one after the other owing to new techniques were tested in relation to the comfort and function in case of usage. 4) Recent research on bed has entered into a new-stage. The studies improving the recovery of functions in the brain and body during the sleep by the use of better mattress has become the central parts of interest.