( This actually works, the problem is very, very few will do it )

Both Prof. Li-Huei Tsai at MIT and Prof. Michael Hamblin of Harvard Medical School discuss photobiomodulation ( light therapy ) as a promising new treatment for alzheimers and dementia.

Li-Huei Tsai is a cognitive neuroscientist and the director of the Picower Institute for Learning and Memory in the Department of Brain and Cognitive Sciences at MIT. Michael R Hamblin is a Principal Investigator at the Wellman Center for Photomedicine at Massachusetts General Hospital, an Associate Professor of Dermatology at Harvard Medical School and a member of the Affiliated Faculty of Harvard-MIT Division of Health Science and Technology. Hamblin's research spans more than 25 years and involves studying a wide spectrum of light frequency and it's effects on the body. His research has focused on the blue, white, infrared and near infrared spectrum of light. He has found benefits to all four types in healing and regenerating tissue.

More research here -

http://www.nature.com/nature/journal/...

http://www.the-scientist.com/?article...

http://news.mit.edu/2016/visual-stimu...

http://photobiology.info/Hamblin.html