Adaptive human interface for refreshing sleep based on biological rhythm

We are trying to make an adaptive human interface of sleep control system. There are 3 steps. At first, the system could be estimate human sleep state. Secondly, system must be an adaptive system for differences among individuals. At last, the system must be able to do something to human to control user\´s state. In this paper, we propose the first step of the sleep control system, the estimation method of the sleep state and human biological rhythm. We are considering about most simple way to control human\´s sleep is to control awakening timing and sleep time. Now, the ordinary alarm clock operates according to the time. And we have to set the "time" in advance. But human has a rhythms in one\´s sleep cycle. The cycle affects one\´s sleep depth and wake-up timing. Moreover the wakening resets human daily rhythm. Therefore, proposed system estimates human sleep quality and rhythms, and stimuli to user at the timing easy to wake. The system using pulse wave to estimate sleep quality because pulse wave can be measured easily than PSG. Additionally, the check system including the estimation algorithm could inform pattern and quality of his daily sleep to a user and then the user can previously arranges his life schedule and pays more attention based on this awareness of sleep results.