Study of Eszopiclone Compared to Placebo on Daytime Function in Subjects With Insomnia Related to Rheumatoid Arthritis

Inclusion Criteria Subject must understand the purpose of the study and be willing to adhere to the study schedule and procedures described in this protocol. Subject must be 25-64 years of age (inclusive) on the day of signing consent. Subject must be diagnosed with rheumatoid arthritis as defined by the American College of Rheumatology. Subject must be on stable regimen for treatment of rheumatoid arthritis for a minimum of 90 days prior to study start. Subject must report a wake time after sleep onset (WASO) of greater than or equal to 45 minutes and less than or equal to 6.5 hours of total sleep time at least three times a week over the previous month and symptoms of insomnia must post date onset of rheumatoid arthritis. Subject physical exam must show no clinically significant abnormal findings (other than those related to rheumatoid arthritis) at screening. Subject must have no clinically significant abnormal laboratory findings at screening (other than those related to rheumatoid arthritis). Subject must have no clinically significant ECG abnormalities at screening. Exclusion Criteria Subject has diagnosis of fibromyalgia, or juvenile rheumatoid arthritis. Subject has history of circadian rhythm disorder, or travels across >3 time zones on a regular basis. Female subject is pregnant, lactating or within 6-months post partum. Subject has a history of drug or alcohol abuse or dependence in the past 2 years or positive urine drug test at screening. Subject has clinically significant unstable medical abnormality or unstable chronic disease (other than insomnia and rheumatoid arthritis) including severe cardiac, renal, or hepatic or respiratory disease, seizure disorder. Subject has participated in any investigational drug study within 30 days prior to screening or plans to participate in any investigational drug study during participation in this study. Subject has a history of malignancy within 5 years, or current malignancy, except for non-melanoma skin cancer. Subject has a current primary psychiatric diagnosis of any of the following disorders: dementia, delirium, schizophrenia, psychosis, other psychotic disorders, dysthymic disorder; major depressive disorder, bipolar disorders; cyclothymic disorder, other mood disorders, primary anxiety disorders, primary panic disorders, or any nocturnal panic disorder. Subject has any of the following Personality Disorders diagnoses: schizotypal, schizoid, borderline personality disorder; or any other personality disorder that would compromise the investigator's ability to evaluate the safety and efficacy of the study medication. Subject has difficulties in sleep initiation or maintenance associated with known medical diagnosis [e.g. sleep apnea]; diagnosed and untreated restless leg syndrome (RLS) or periodic leg movement syndrome (PLMS). Subject has used any drugs known or suspected to affect hepatic or renal clearance capacity within a period of 30 days prior to screening. Subject reports consumption of more than two alcoholic beverages daily, 14 or more alcoholic beverages weekly, or five or more alcoholic beverages on any given day. Subject is a rotating or third/night shift worker. Subject is a staff member or relative of a staff member.