We describe 14 hypersomniac patients whose polysomnographic recordings revealed abnormal EEG patterns consisting of paroxysmal epileptic discharges during stages 2 and 3 of NREM sleep, associated with arousals, fragmentation of sleep, and reduction in sleep efficiency, particularly REM sleep. Three patients who received anticonvulsants showed clinical and polysomnographic documented improvement in sleep patterns. These patients probably had a unique form of nocturnal epilepsy-related sleep disorder, manifested by paroxysmal wakenings from sleep.
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