The human factor is one of the major causes that contributed to a road traffic accident (RTA). This study aims to identify the correlation between sleep duration and safe driving attitude among young adult in Malaysia. The significant relationship showed between Domain (D) 1, 4 and 5 of ASDS-46 with sleep duration (ESS). D1 (self-complaint), D4 (self-concern) has positive correlation (p= .110 and .147) and D5 (driving style) has negative correlation (p=.132). In conclusion, short sleep duration may influence the risk of RTA, and on-road assessment is recommended for further investigation.Keywords: Young adult; Sleep quality; Driver’s attitude; Human factorseISSN: 2398-4287 © 2019. The Authors. Published for AMER ABRA cE-Bs by e-International Publishing House, Ltd., UK. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/). Peer–review under responsibility of AMER (Association of Malaysian Environment-Behaviour Researchers), ABRA (Association of Behavioural Researchers on Asians) and cE-Bs (Centre for Environment-Behaviour Studies), Faculty of Architecture, Planning & Surveying, Universiti Teknologi MARA, Malaysia.DOI: https://doi.org/10.21834/e-bpj.v4i11.1726