HELP !.

Oh dear Music that is very difficult & clueless has made some very good points, but one glaring one to me is... Is Mrs Music worrying she may also get dementia..??? Maybe she is consciously or unconsciously worrying about that fact.. It does seem to run in families sometimes & can cause a huge strain..
My friends husband got into a similar situation but would not talk about the real worry for a long time, which was "that he would get it too", but once he shared that fact & talked to his doctor about it he has been a lot better..
She could also be completely over-doing it with her sister & is so mentally exhausted she cannot turn her brain off..
If that is the case then a few weeks of practising relaxation before bed may show some signs of help, but there is no instant fix I know of.. Difficult time then... Thinking of you both..