Thank you, Annie, for this very informative post on mental fatigue. I have noticed it, also.

My response is not going to be scholarly, but I have noticed that my mental fatigue acts like my other symptoms. I am better at the start of the day, and I get worse with my alertness and mental focus at the day progresses and I get more tired. So, if there are things I need to do which require concentration and thought, I try to do those things in the morning and get them done right away! If I attempt to do them in the late afternoon or evening, it usually doesn't go very well. I'm just too tired, and it's a lost cause. Some days I am just too tired and having too much trouble with my symptoms to really do much of anything, and I have to take the day off from everything. It's just the way it is. It's hard when I have multiple days in a row like that, but I don't know how one fixes it. I hope things will gradually get better with time, but that's the way things are for me at present.

Best wishes to everyone,
Erin