This paper discusses, from the perspectives of aesthetics and psychology of literature and art, how artists can effectively express reality through dreams in their paintings. The discussion primarily revolves around several key questions. On one hand, it explores why artists choose dreams as a subject for their creations, why dreams represent a form of reality, and why paintings should also express reality. On the other hand, it acknowledges that while dreams can serve as an intuitive visual representation, they often feature absurd and chaotic scenarios. This paper aims to help art practitioners see the psychological logic of dreams in order to find the truth deep within their hearts. It also discusses how using dreams as a subject can visually present reality and emotionally resonate with the audience.