Nocturnal seizures.

As a subset of epilepsy, nocturnal seizures amplify one of the major problems of epilepsy in general: episodes are less likely to be directly witnessed than daytime seizures, and therefore diagnosis and characterization are more difficult. As a sleep problem, nocturnal seizures are not benign, and the resulting sleep disruption can cause daytime somnolence and concentration difficulty. This article outlines three major topics in nocturnal seizures: differential diagnosis (distinguishing between seizures and parasomnias), the effects of nocturnal seizures on sleep structure, and specific syndromes of primarily or exclusively nocturnal seizures.