[header] How to prevent falls in dementia patients [title] Make sure lighting is sufficient. [step] Dementia can affect how a person sees and interacts with their environment, and so good lighting can help them to judge distances better. Adding more light can decrease shadows and make the room clearer, which can help a person see better. 
Make sure there's bright enough lights in the whole home, preferably easy-to-access ones. [substeps] It can help to add nightlights as well, especially if the person is used to not turning on the lights when they get up at night.