Pelvic movements as rhythmic motor manifestation associated with restless legs syndrome

Video‐polysomnographic monitoring of a patient with a 4‐year history of an unpleasant restless sensation originating in his lower abdomen showed stereotyped, repetitive, rhythmic pelvic body movements resembling coital behaviour at the wake–sleep transition. We discuss the association between restless legs syndrome and rhythmic movement disorder as a particular manifestation of a spectrum of rhythmic sleep‐related movement disorders.