Wellune proposes a way for users to get a comfortable and healthy sleep by analyzing sleep data such as sleep patterns and sleep environments by linked sensors. Midnight Blue, reminiscent of the night sky, was applied as the main color to create an atmosphere related to sleep, and we used micro-interaction properly to make users have more interesting and fun experiences when using the app. Also, each situation setting and status is provided with friendly illustration and animation guide to provide a design that is easy for users of various ages to understand.