It is interesting when you talk about vitamin D and the sun. I ALWAYS feel better when I'm outside on a sunny day - which is why it is so good that spring and summer are next up. My brain fog is less outside - I know part of it is because I am out of the recirculated air and chemicals inside, but I wonder if part of it is because of the vitamin D. My favorite thing to do is to sit on the beach - I always say that if I moved there, I would be a zillion times better!