Some epilepsy syndromes feature activity exclusively or predominantly during sleep and can be confused with other nocturnal events, such as parasomnias. These syndromes include:

The following pages describe some of the features distinguishing common parasomnias from nocturnal seizures and psychogenic events. Features that can be used in the differential diagnosis of nocturnal events include the time of occurrence, whether the patient remembers the event, stereotypical movements, and polysomnogram findings, as summarized in Table: Differential Diagnosis of Nocturnal Events.