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An 11-month-old 3.66-kg (8.05-lb) castrated male domestic shorthair cat was evaluated because of a history of hypnic jerks since the owners acquired him. The cat had been found roadside at 2 weeks of age and had since been an indoor cat in a multicat household. Hypnic jerks are brief, myoclonic muscle twitches that occur at sleep onset occasionally in clinically normal individuals. This cat's hypnic jerks had progressed to focal seizures with impaired consciousness 4 months prior to evaluation. The seizures involved sudden bursts of violent activity and altered consciousness. Initially, seizures occurred several weeks apart but increased in frequency