Exposure to light appears to have therapeutic effects on Alzheimer's disease patients, a Wayne State University researcher has found. In a study published recently in the Western Journal of Nursing Research, LuAnn Nowak Etcher, assistant professor of nursing, reported that patients treated with blue-green light were perceived by their caregivers as having improved global functioning. Caregivers said patients receiving the treatment seemed more awake and alert, were more verbally competent and showed improved recognition, recollection and motor coordination. They also said patients seemed to recapture their personalities and were more engaged with their environment. Patients' moods also were described as improved.

http://www.eurekalert.org/pub_releases/2012-01/wsu--twl011112.php
http://medicalxpress.com/news/2012-01-treatment-benefits-alzheimer-patients.html
http://www.news-medical.net/news/20120112/Exposure-to-light-appears-to-have-therapeutic-effects-on-Alzheimers-patients.aspx