Here's a short story-poem by Jorge Luis Borges, called Dreamtigers, from his book "El Hacedor" (The Maker) that connects our exploration of dreams to the research, expectations, and sometimes disappointments of real life:
In my childhood I was a fervent worshiper of the tiger-not the jaguar, that spotted "tiger" that inhabits the floating islands of water hyacinths along the Parana and the tangled wilderness of the Amazon, but the true tiger, the striped Asian breed that can be faced only by men of war, in a castle atop an elephant. I would stand for hours on end before one of the cages at the zoo; I would rank vast encyclopedias and natural history books by the splendor of their tigers. My childhood outgrown, the tigers and my passion for them faded, but they are still in my dreams. In that underground sea or chaos, they still endure. As I sleep I am drawn into some dream or other, and suddenly I realize that it's a dream. At those moments, I often think: This is a dream, a pure diversion of my will, and since I have unlimited power, I am going to bring forth a tiger.
Oh, incompetence! My dreams never seen to engender the creature I so hunger for. The tiger does appear, but it is all dried up, or it's flimsy-looking, or it has impure vagaries of shape or an unacceptable size, or it's altogether too ephemeral, or it looks more like a dog or bird than like a tiger.
- Jorge Luis Borges