My sister is 82 and most of the family thinks she is getting dementia. There has been no medical evaluation though. Should I insist/encourage her to get evaluated? Family doesn't seem to be on board with that. My sis did say that she would want to know but I'm not so sure. She usually says she can't remember things because she "didn't sleep well" - she has been a chronic insomniac for decades but I realize that age/insomnia may be contributing to her forgetfulness.