People with Multiple Sclerosis know what cognitive exhaustion is all about.

http://www.everydayhealth.com/sanjay-gupta/multiple-sclerosis/what-causes-mental-exhaustion-ms/?xid=nl_EverydayHealthLivingWithMultipleSclerosis_20161025   I am beginning to realize when i start getting MS cognitive exhaustion, and know when to lie down and reset my energy level. It's worse when I get out and about in the community, where too much stimulation causes me to have what I call "Brain farts" and I lose my concentration, I also can cover up by saying I'm having a senior moment