I don't, to my knowledge have dementia but I have lost a father-in-law to Alzheimer's and know neighbours who have had to care or are caring for loved ones with one of these brain diseases.
I went to a Dementia Friend session earlier this month given by a friend of mine Dr Shibley Rahman.

This is a link to his blog about dementia. These conditions are of professional interest to him and he is a Dementia Champion. I hope you find his blog interesting.

http://shibleyrahman.com/dementia-2/why-i-do-dementia-friends/