Purpose: The purpose of this study was to identify sleep quality according to a sleep model, to examine factors influencing sleep quality in nursing students and non nursing students. Methods: A cross sectional study was conducted with 154 nursing students and 155 non nursing students at several universities and college in Seoul. A self administrated questionnaire was used for data collection and data were analyzed descriptive statistics, t test or ANOVA, and regression with SPSS/WIN 14.0 program. Results: Sleep quality of nursing students is lower than non nursing students. Sleep qualities showed significant differences according to academic self efficacy, stress, depression and daytime sleepiness in nursing students and stress, depression and daytime sleepiness in non nursing students. Significant factors influencing sleep quality of nursing students was stress and for non nursing students, daytime sleepiness. Conclusion: The findings indicated the importance of sleep hygiene education for nursing students is that results in sleep quality.