What theme is the novel "The Haunted Mind" by Nathaniel Hawthorne?

The Haunted Mind revolves around a series of dreams..... the subconscious. In the end, we come to realize that through these dreams, the main character is reliving his life..... seeing his life pass before his eyes as he succumbs to the final dream, which is death. The themes in the story are death, dreams, and regrets.