Many students and educators know that sleep is important to learning, yet there exists a gap between their knowledge and behavior. For example, fewer than 10% of students sleep 8 hr before final exams. In the context of two undergraduate courses on sleep (N = 34), students could earn extra credit if they averaged =8.0 hr of sleep during final exams week. Sleep/wake patterns were monitored objectively using actigraphy. The 24 students who opted in to the challenge averaged 8.5 hr of sleep (n = 17 succeeded). Short sleep (=6.9 hr) occurred on only 11% of nights, significantly less than early-semester baseline (51%) and comparison group (65%) data. On the final exam, students who slept =8.0 hr performed better than students who opted out or slept =7.9 hr, even after controlling for prefinal grades. The 8-hr sleep challenge provides proof of principle that many students can maintain optimal sleep while studying, without sacrificing test performance.