A large study of patients undergoing light therapy, published in the prestigious Archives of General Psychiatry, found major clinical 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 are provided by CET - Center for Environmental Therapeutics (www.cet.org).
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.