"Lying Awake" is a novel by Mark Salzman that was published in 2000. The book tells the story of Sister John of the Cross, a Carmelite nun who is experiencing visions that she believes are messages from God. The visions inspire her to write beautiful poetry that becomes famous among her fellow nuns and the wider community. However, Sister John's visions are accompanied by severe headaches that threaten her health and her ability to continue writing. As she struggles with her physical and spiritual challenges, Sister John begins to question the authenticity of her visions and the nature of her faith. The novel explores the themes of faith, doubt, and the pursuit of artistic expression, as well as the relationships between individuals and their communities. "Lying Awake" is a thought-provoking and introspective work that has been praised for its lyrical writing and sensitive treatment of religious themes.