ELECTElftA review of the published literature on effects of anti-convulsant medication on sleep patterns revealed few studies. The paucity of studies is probably due to the fact that all-night, EEC-recorded sleep studies are not part of the usual diagnostic procedures for seizure patients. Seizure patients are seldom referred to the sleep laboratories and clinics, where the all-night sleep recording is routine. Also, few patients are treated by a single convulsant.Host studies have used barbiturates, and the effects of this class of drug on sleep stages appear to be the same whether the barbiturate is prescribed as an anti-convulsant or sedativehypnotic. The same sleep stage chang ys are also found for the benzodlazepines used as a sedativehypnotic and as an anti-convulsant. Acute studies indicate that anti-convulsants decrease REM sleep, while chronic ingestion decreases SWS, but total amount of NREM sleep is less affected. Sleep spindles usually are Increased. An epileptic patient's sleep pattern is most likely to be more normal or stabilized after effective treatment. This normalization appears to be due to the control of nocturnal seizures, which previously disrupted sleep, rather than due to any effect of the anti-convulsant per se on sleep patterns.