In modern society, insomnia which is the lack of sleep is becoming a serious problem. In this paper, sleep-promoting robot is proposed as an aid to sleep-onset insomnia which is one of the most typical insomnia. The basic concept of the robot is to shorten the sleep-onset time by giving the personal adapted stimulation effective in relaxing. Now, as one of the fundamental researches, we inspected the availability of personal adaption in sleep experiment. As a result, it was uncertain whether subjects were sleep-promoted. One of the main reason was that the target condition differed drastically. Therefore an appropriate evaluation with fixed target condition should be regained in the future work.