The aim of the study was to investigate sleep duration, difficulties in sleeping, feelings of tiredness at school, television and computer habits, among primary school children. A questionnaire concerning television and computer habits and length of sleep was given to 208 children8-12 years of age from two public primary schools in southern Sweden in 2007 and 2008. For each of the school grades involved, differences in television and computer habits between children sleeping less than the median length of sleep in each grade and those sleeping more were investigated. Associations between short sleep, televisions habits and feelings of tiredness were studied using multivariate logistic regression analysis. Short sleep was found to be associated with having a bedroom TV (p=0.005), spending more than two hours a day either at the computer or watching TV (p=0.012) and feelings of being tired at school (p=0.001).