The purpose of this study was to explore the effects of sleep on academic performance and job performance. A total of 172 undergraduate students completed an on-line questionnaire and their GPAs were obtained from the registrar's office. Data were analyzed using t-test, principal component analysis, and step wise regression. The results were consistent with delayed sleep phrase syndrome, a common sleep problem in college students. Also, sleep latency and sleep medicine were negatively correlated with academic performance, and sleep quality was significantly associated with job performance. The knowledge of the impact of sleep is effective for educators and employers in helping students with sleep problems. Educators and employers need to be cognizant of the importance of sleep for students' success in their academic performance and job performance.