Children with epilepsy are at risk for problems in daytime functioning. We assessed daytime sleepiness, on-task behavior and attention in 17 children (aged between 7 and 11 years) with epilepsy who visited a school for special education and compared these to 17 children from a control group who visited a regular school. Within the group of children with epilepsy, we explored whether behavioral and cognitive functioning varied across days of the week and times of the day. Data were collected during four consecutive school days. Children with epilepsy had more daytime sleepiness, less on-task behavior and less attention than controls. Furthermore, sleepiness and on-task behavior varied cross days of the week and times of the day, an effect that was not found in controls. Implications for educational practice are discussed. (Contains 4 tables.)