Edgar Allen Poe's poem "A Dream within a Dream" has a depressing and distressed tone. The poem describes how life slips away from us gradually, like grains of sand slipping through our fingers. Poe suggests that life is fleeting and precious, but death ultimately comes for us all like the ocean waves, washing away any memories of our existence. The poem expresses the speaker's distress at the idea that he will eventually be forgotten after death, with his life feeling meaningless like a dream.