Efficacy and Safety of SR46349B in Patients With Sleep Disorders in Fibromyalgia

Inclusion Criteria: * Each patient must fulfill the diagnosis criteria of fibromyalgia according to the American College of Rheumatology * Based on patient's information: * The patient must complain of unrefreshing sleep for at least 3 nights per week over the past month. * The patient spends at least 6.5 hours and not more than 9 hours, in bed, each night over the past 2 weeks. * Female patients of childbearing potential must have a confirmed negative pregnancy test at the end of the screening period and use an acceptable method of birth control throughout the study * Written, signed and dated informed consent must be obtained from each patient * Willing to abstain from taking any medication or treatment prohibited as per the protocol Exclusion Criteria: * Females who are lactating or pregnant * Night shift workers, and individuals who nap 3 or more times per week over the preceding month (nap: intentionally sleeping for more than 20 minutes during the day). * Consumption of beverage with caffeine (i.e. tea, coffee, or cola) comprising more than 2 cups or glasses per day * Past or Current medical history of any significant, severe, or unstable acute or chronically progressive medical or surgical disorder which may affect patient safety