<figure id="attachment_71279"><img width="600" height="243" src="https://www.sciencealert.com/images/2021-12/processed/AlzheimersNeurons_600.jpg" </figure>
Stimulating a key part of the brain using light helps Alzheimer's patients sleep better and improves their psycho-behavioral symptoms, according to a review of studies involving nearly 600 people with the disease.
