ASP8825 - Study in Patients With Restless Legs Syndrome

Inclusion Criteria: * Patients with RLS, based on the International RSL Study Group Diagnostic Criteria * History of RLS symptoms at least 15 nights in the prior month or, if on treatment, this frequency of symptoms before treatment was started * Documented RLS symptoms for at least 4 of the 7 consecutive evenings/ nights during the baseline study period Exclusion Criteria: * A sleep disorder (e.g., sleep apnea) that may significantly affect the assessment of RLS * A history of RLS symptom augmentation or end-of-dose rebound with previous dopamine agonist treatment * Neurologic disease or movement disorder (e.g., diabetic neuropathy, Parkinson's Disease, Multiple Sclerosis, dyskinesias and dystonias