The purpose of this study was to identify the psychological factors affecting the quality of sleep and to understand the aspect of sleep in students at the department of nursing. The period of data collection was from June 1, 2016 to June 15, 2016. The subjects were 3rd and 4th grade nursing college students of an university in Busan. The data of 186 students who voluntarily participated in the self - filling questionnaire were analyzed. According to the results of the study, the quality of sleep according to the general characteristics was poor in the fourth grade, BMI of 23.0 kg/m2 or more and not to drink coffee at all. The ESS, GASS, CES-D, and MOCI were higher in poor sleeping more 5 points than those of good sleeping less than 5 points in PSQI. Regression analysis showed that ESS and CES-D had an explanatory power of 29.8% in sleep quality. Nursing students are inevitably exposed to stress due to excessive academic capacity and irregular practice. It can cause serious problems after graduation. Therefore, it is necessary to improve the sleeping and psychological problems of individual students as well as institutional improvement to ensure adequate rest and sleeping time.