hello!! i take care of my grandmother who has dementia. she has really good days where she acts almost like how she was before hand and then days where things, to put it bluntly, just don't seem as bright. we used to think it happened at random but we're noticing she seems to be really off whenever the weather changes or gets rainy. after a couple days she's back to normal. is this a normal thing? is there a reason? or is it just just a coincidence?