Sleep is a condition of the body and mind which typically occurs for several hours every night, in which the nervous system is inactive, the eyes are closed, the postural muscles are relaxed, and consciousness are practically suspended. Daytime sleepiness, or difficulty in maintaining a desired level of wakefulness, is frequently viewed by the general population as a common experience and predictable consequence of insufficient sleep. The aim of this study is to determine the prevalence of excessive day time sleepiness and factors associated among medical students of MAHSA University. A cross sectional study was conducted among year 1 to year 5 medical students at Saujana Putra Campus and Jalan University Campus of MAHSA University employing Systematic random sampling method. A self-administered questionnaire was used to collect data from the respondents. The data was analysed by using Statistical Package of Social Sciences (SPSS) version 19.0. A minimum sample size of 400 was obtained. The prevalence of Excessive day time sleepiness (EDS) among medical students of MAHSA University was expressed by percentage-44% (176 of 400). Association between EDS and other independent variables was seen by Chi-square test with p value < 0.05 as significant association. Of the various factors determined, statistically significant association was found between internet usage and EDS. This study provides an insight into medical students on prevalence of EDS which is high. As the students are now aware of their ESS score they can better manage their sleep cycle and prevent themselves from the consequences of EDS.