 We will recruit adults, age 18-64 years, who meet diagnostic criteria for seasonal affective disorder by means of public service announcements in the community. The approved announcement will be released via the Partners weekly research announcement system, may be disseminated to press outlets, and will be used on the voice mail menu of Dr. Andersons SAD clinical services at BWH. An informational webpage linked to the BWH website will provide more detailed information and a mechanism for prospective subjects to request further information. Interested individuals will be directed to a research assistant at the BWH Clinical Trials Center who will answer questions regarding the study and will conduct a telephone screening to assess eligibility. Those subjects found eligible and interested will be referred by the research assistant for a psychological screening interview. 