A large study of those using bright light therapy to address the symptoms of the winter doldrums, showed major improvement in about 80% of cases when the light was scheduled at an optimum early hour. If the light was scheduled later, the response rate dropped to about 40%.
Self Assessments provided by CET - Center for Environmental Therapeutics (www.cet.org) are one way to determine if symptoms follow a seasonal pattern. CET is a non-profit organization that is dedicated to the education about, and further development of, environmental therapeutics. The Self-Assessment is copyright protected by CET and you will be entering their web site when taking the assessment test.
