I found in The Book of Fantasy, edited by Jorge Luis Borges, Silvina Ocampo and Adolfo Bioy Casares this short text by Chuang Tzu:
“The philosopher Chuang Tzu dreamed he was a butterfly, and when he woke up he said he did not know whether he was Chuang Tzu who had dreamed he was a butterfly or a butterfly now dreaming that it was Chuang Tzu.”
What did you dream you were?