After what turns out to be a fateful accident, Ana María spent three years in and out of a clinic in Hermosillo, the city in which she spent the last of her lives. Following her death, the secret biography of her life reveals one of her first ones: she lived in Mexico City, she had a husband and four children, and she abandoned it all. The threads that connect the two existences are explained in this novel that is simulataneously a biography of loss, a love letter, a kaleidoscope of pain, a quest and a discovery. Pain is so difficult to overcome precisely because it invokes the absence of a story. Sleeping Language is an act of reflection in the face of orphanhood, the mental journey of a son in search of his dead mother.