Chuang Tzu said, "I understand that a dream is a dream. The problem is that I am worried, who am I? If Chuang Tzu in his sleep can dream that he has become a butterfly, a butterfly in her dream can see she has become Chuang Tzu. And now I am puzzled. Who am I? -- a Chuang Tzu or a butterfly?

It is said Buddhas never dream; one who is awakened never dreams. Because even dream cannot happen to him; he cannot be deceived. He sleeps in a totally different way the quality is different. Only his body sleeps, relaxes. His being remains alert.