In both groups (patients with epilepsy and healthy controls) we used a questionnaire Epworth Scale of Sleepiness (ESS) (Johns, 1991). By answering eight questions about probability of falling asleep in standard situations we came to the result, . score of daytime sleepiness ranging from 0 to 24. Rate 0-9 is considered as normal value, above 9 as elevated daytime sleepiness and value above 16 is considered as remarkably elevated daytime sleepiness (Watanabe et al., 2003). All patients with epilepsy were evaluated by Multiple Sleep Latency Test (MSLT) (Carscadon & Dement, 1982) in order to objectivise the daytime sleepiness. The latency of sleep was measured in five 20 minute.
