In the Washington Post [12/30/17 issue] there is an article about a memory care facility in Germany that is experimenting with a new concept. Since most dementia cases long term memory is present, why not design a large room that represents that era in time. Sort of like a museum of that place in time, with music playing from that time, too.
Example for here in the States, design a room from the 1940's or 1950's. Have in that room products that were popular back then. Old TV set, old radio, manual typewriter, old Sears catalog, old LIFE magazines, ice cream advertisements, grocery store products, etc. That will get the residents talking to each other about those items and that section of time in their life that they can remember so well.
What was amazing, according to the German memory care facility, the residents started to eat better, drank more water, and suddenly they were able to go to the bathrooms by themselves.
Another thing this memory care did was teach the Staff about this nostalgia, so that they could relate to the resident. The facility also had a Hollywood themed room which was quite popular among the residents.
I would love to see that happen here, but I could be a fly on the wall at Corporate and hear someone say "the space would take up 3 rooms that could be used by paying residents".... [sigh].