Once again I am trying to figure out PMR. Yesterday I came home from work beause my brain was so fatigued it just shut down. I work at at an elementary school full time and the day before had computer training that was similar to trying to learn Chinese. The fog started then. Didn't sleep well for 2 nights either. Also getting back on schedule after xmas holiday. What brings on the fog? For me it's brain fatigue. Physically I feel pretty good if I could take my head off. I also am a week off a gluten free diet that I didn't think was making any difference but maybe it was? On another site I saw a suggestion of taking pred in the pm so I tried that by splitting my dose last night. This morning my head is clearer but will see as day goes on. Is brain fog from stress, fatigue, medicine, gluten? Thanks all for your faithful experiences.