Children with Autism Spectrum Disorder (ASD) have more sleep disturbances than typically developing (TD) children. Common sleep problems in ASD include difficulty in initiating sleep, maintaining sleep and shorter total sleep time. However, previous findings are largely based on Western countries (Australia, Finland, Sweden, United Kingdom and United States). Sleep problems have been associated with day-time attentional difficulties in TD children. For children with ASD, sleep problems can further exacerbate their preexisting difficulties in shifting attention and sustained attention. Yet, few studies have examined if sleep can impact attention among children with ASD. Use of more objective measures are needed to accurately quantify sleep problems in Asian countries such as Singapore as well as examine cognitive skills in relation to sleep.