Abstract
Recently, the importance of sleeping habits is pointed out as we live healthily with both mind and body. However, Japanese sleeping habits have a short sleeping time and bedtime is slow. Especially as sleep gradually declines after entering school, it tends to become irregular, which has a problem that it adversely affects student life. Generally, young people often evaluate optimistically for sleeping, so we suppose that it is important for subsequent university life to acquire correct knowledge about sleep quality and to promote sleep habit at early time of admission. In this research, we propose a feedback system which strengthens habitual sleeping with the aim of transitioning from indifference stage to interesting stage in behavior change stage model.