Poor sleep quality among college students increases the risk for lower grade point averages, compromised learning, impaired mood, and motor vehicle accidents; and associated with several unhealthy behaviors and outcomes including substances/drugs use (alcohol and medications), and weight gain. Therefore, we assessed college sleep quality in relation to the NMUPD and BMI among a large sample of college students using the fall 2010-spring 2011 national survey data (American College Health Association-National College Health Assessment (ACHA-NCHA)). In addition, we used theoretical model integrating HBM perception constructs and behavioral intention to describe and predict college students' sleep quality among a sample of WVU undergraduate students. The goal of this dissertation was to better understand students' sleep quality. Study results can help in establishing theoretically driven interventions to promote students' sleep quality. Poor sleep was common among a large national sample of college students and among WVU college students. The NMUPD was significantly associated with poor sleep quality, and poor sleep quality significantly increases the predicted values of BMI and increases the risk of being overweight and obese. In addition, poor sleep quality was also associated with having more unhealthy days among WVU students. The HBM and the behavioral intention (TPB) have significant roles in prediction poor sleep quality among a sample of WVU college students. Our results extend the current knowledge regarding the association between NMUPD and poor sleep quality, the association between poor sleep quality and overweight and/or obesity, the association between poor sleep quality and poor HRQOL, and the significant roles of HBM and behavioral intention in explaining sleep quality among college students. Moreover, we add to the current literature the influence of the HBM on behavioral intention, which make a very significant combination in predicting sleep quality among college students. Therefore, assessment of college students' sleep quality should include screening for NMUPD, overweight and obesity, HRQOL as potential risk factors for poor sleep, and may all be interrelated. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]