1. "It's all a dream that the song ends, and the prosperity comes to nothing." It describes that life is short and impermanent. No matter whether it was once prosperous or happy, it will eventually dissipate, just like a dream.

2. "It's hard to sleep after tossing and turning, and it's hard to sleep alone in the middle of the night" depicts the inner anxiety and loneliness, and it's hard to sleep alone even in the dead of night.

3. "Life is like a dream, and a monologue is self-contained" expresses that life is like a dream. Just like a monologue, everyone plays his own story on his own stage.

4. "How many flowers fall in my dreams, and I love myself in a monologue" is helplessness and sadness for life. Even in my dreams, I can't escape the impermanence and loneliness of life.