In her book "Packing for Mars," Mary Roach explores the effects of space travel on the human body and mind. She delves into various physiological and psychological reactions that astronauts experience in microgravity, including the surprising phenomenon that can occur as brain cells begin to deteriorate due to lack of oxygen. This process leads to moments of euphoria and unexpected physical responses, shedding light on the complexities of life in space.

Roach's writing illuminates the intriguing and often bizarre aspects of human endurance and adaptation in extreme environments. The quote captures a stark reality of the human condition, indicating that even in the face of dire circumstances, there can be unexpected sensations and pleasures, highlighting the resilience and complexity of human physiology under stress.