concentrationache
when you have had a really hectic day at the office, full of meeting, stats analysis, email and no smoke breaks, by the end of the day, your ability to concentrate is so low, or trying to concentrate gives you a headache, this is concentrationache. A good douse of weekendnesia will help balance the sclaes
Man, I had three back to back meetings before noon, then i presented the sales forecast for the next quarter, and just to add to the concentrationache, I still have to respond to the urgent emails waiting for me