The Fault In Our Stars, by John Green

The BiPAP essentially took control of my breathing away from me, which was intensely annoying, but the great thing about it was that it made all this noise, rumbling with each inhalation and whirring as I exhaled. I kept thinking that it sounded like a dragon breathing in time with me, like I had this pet dragon who was cuddled up next to me and cared enough about me to time his breaths to mine.