ABSTRACT

Excessive fragmentary myoclonus is defined as a “normal variant” under the subgroup of sleep related movement disorders. It has no known clinical consequences. Here a 72 year-old man, in whom polysomnography recordings revealed continuous excessive fragmentary myoclonus during wakefulness and sleep was presented and it was aimed to emphasize this benign clinical table which is not to be defined as a disease but a normal variant. It is of great importance especially for clinicians scoring polysomnography to be aware of this normal variant in order for differential diagnosis of sleep related movement disorders.

Keywords: Excessive fragmentary myoclonus, normal variant, sleep related movement disorders, polysomnography