According to the Merriam-Webster dictionary, a sleepwalker is a person who suffers from somnambulism or walks while sleeping. 

This song tries to describe how good and bad dreams come true. 

If we understand, deeply, the journey of each person's life on one side is like a shadow from their dream, and on the other side chasing their shadow. The reality of life, some of which are the reality of their dreams, at the same time dreams also provide energy for humans to devote efforts in their lives. Dreams can turn into desires, and desires are formulated into needs that require the outpouring of effort and resources. Sometimes, humans live in their unconsciousness and are at risk of mistakes and miracles.