Korean J Fam Pract 2015; 5(3): 218-223  
Relationship between Study Achievement and Sleep Hours & Sleep Satisfaction: Findings from the 2013 Korea Youth’s Risk Behavior Web-Based Study
Sung-Jung Cho1, Sang-Mi Park2, Kyung-Do Han3, Jong-Hyuk Choi1, Kyung-Hwan Cho1, Byoung-Duck Han4,*
1Department of Family Medicine, Korea University College of Medicine; Departments of 2Family Medicine and 3Medical Statistics, The Catholic University of Korea College of Medicine; 4Department of Family Medicine, Sahmyook Medical Center, Seoul, Korea
Received: August 28, 2014; Accepted: August 28, 2015; Published online: September 30, 2015.
© The Korean Academy of Family Medicine. All rights reserved.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Background: Sleep plays an important role in human life and health for basic physiologic function. In Korea, many students sleep for a fewer number of hours and use the extra time to study. This study aimed to clarify the relationship between study achievement and sleep hours and sleep satisfaction.
Methods: We used data from the 2013 Korea Youth’s Risk Behavior Web-Based Study, conducted by the Korean Center for Disease Control (72,435 male and female students). We studied the relationship between study achievement and sleep hours and between study achievement and sleep satisfaction. The data were analyzed using logistic regression.
Results: Student who reported satisfactory sleep had higher study achievement than those who reported average sleep, and students who reported average sleep had higher study achievement than those who reported unsatisfactory sleep. Students who slept less than 6 hours had higher study achievement than those who did not. Students who slept from 6 to 8 hours and reported satisfactory sleep had higher study achievement than the others.
Conclusion: An adequate number of sleep hours and satisfactory sleep play an important role in study achievement.
Keywords: Sleep Deprivation; Academic Performance; Adolescent

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