This study will recruit bipolar disorder patients currently mood stable on a therapeutic dose of an anti-manic medication. Stable mood will be defined as a Young Mania Rating Scale score ≤10 and Hamilton Depression Rating Scale ≤10. Subjects must have a diagnosis of bipolar disorder confirmed by the Mini International Neuropsychiatric Interview (MINI). YMRS and MINI are common research questionnaires used in bipolar disorder studies. Potential subjects will be identified and approached during an outpatient clinical visit by a member of the research team and identified by their treating physicians and referred to the researchers.