Maybe not for people with dementia - but I must make the comment that for my 80th birthday, my children arranged for me to have a recliner/riser chair.
I went to Careco, and they had an enormous range of these. The one I chose has FOUR motors - so one for reclining back, one for raising legs and one each for my neck area and lumbar one.
I was measured and this was made for my size, several choices of material so was able to select one that tones in nicely with my other living room furniture.
I really love this chair. Been using it now for five years, and it gives me total comfort and is easy to use. On my Karndean flooring, it is relatively easy to move when necessary. On occasions I have slept in it.
I do find Careco has an excellent range of equipment, although over the years with this chair and other mobility equipment I have also found that their after-sale service is poor (to say the least)!!!