The prevalence of internet use among adolescents has extremely increased and has negative impact on adolescents' lives. It appears to be related with problematic sleep habits and sleep problems. The study aimed to investigate the relation between internet addictions and sleep problem among adolescents. Research design: A Cross-sectional research design was adopted for this study. The study sample: A total of 180 adolescents were recruited to the study which selected randomly from three preparatory and secondary schools at Assuit City in October 2016.