In "The Rosie Project" by Graeme Simsion, the protagonist expresses a clear stance on coffee consumption in the late afternoon. He believes that drinking coffee after 3:48 p.m. disrupts sleep patterns due to the nature of caffeine, which has a half-life of three to four hours. This perspective emphasizes the importance of managing caffeine intake for better sleep quality, especially for those with regular work schedules.

The character criticizes the practice of serving coffee in the evening, such as at 7:00 p.m., as it can lead to inadequate rest for individuals who need to maintain conventional job hours. This highlights the broader theme of how lifestyle choices can significantly impact health and well-being, particularly regarding sleep and productivity.