I watched my Dad progress, beginning with MCI .. it's a tough scenario to deal with .. Hope can never be lost ..
Although I don't like to offer advice or commentary on issues of this sort, since all people are different, you might consider looking into a low dose Clonazepam 1/2 - 1mg, just before bedtime .. in my case, although I don't suffer from MCI as of yet (there are those that would dispute that ..

) .. it provides a good sleep and takes the edge off the next day .. I am a worrier as well as a bit paranoid

.. my DR scripted about 9 years ago when my business began to take major financial hits due to the Recession ..
Just my

.. good luck to you both .. Positive Thoughts being Beamed South ..