Interesting, I didn't know much about the light therapy for Alzheimers treatment before I stumbled on this post. I've read up on it and found a lot of evidence to support exactly what you say. For anyone else interested in the subject of light therapy / Alzheimers disease, here are a few of the links I found: Article in Sleepreview Medicinal News Today article by Leslie H Lang Sage Journals (need to register here) Alzimers and light therapy, some info here Paranoid delusions and hallucinations and bright light therapy in Alzheimer's disease