12-week Polysomnography Study of Ropinirole Controlled Release for Restless Legs Syndrome

Inclusion criteria: * provided written informed consent. * Diagnosed with primary RLS using the International RLS Study Group Diagnostic Criteria with a total score of 20 or greater on the International RLS (IRLS) Rating Scale and significant sleep disturbance indicated on Item 4 of the IRLS rating scale. * Have evening and nighttime symptoms of RLS, significant sleep impairment due to RLS symptoms, and symptoms requiring treatment prior to bedtime, but no earlier than 5:00PM. * Sleep efficiency \<85% OR Latency to persistent sleep \>20 minutes. Exclusion criteria: * Secondary RLS * Primary sleep disorder * Have any medical conditions that may impact efficacy assessments or that may present a safety concern. * Pregnant or lactating or women of child-bearing potential who are not practicing an acceptable method of birth control. * Use of any prohibited medication.