Brain Fog

I was about to say I feel as though I have brain fog today from lack of sleep, but I guess it's a little more serious than grogginess.

Cognitive Disfunction, or Brain Fog, is defined by Wikipedia as "unusually poor mental function, associated with confusion, forgetfulness and difficulty concentrating. "

There is even a website dedicated to it...

www.brainfog.net

(the only guide to brain fog that matters!)