My mind always is racing with thoughts. It's better now that I'm on Anafranil for my OCD, but I still have a very difficult time most nights getting my brain to "turn off," unless I'm super tired and literally fall asleep instantly. I'm always thinking. My orbitalfrontal cortex is forever in hyperdrive. It certainly can get annoying. 
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Helinger: Now, what do you see, John?
Nash: Recognition...
Helinger: Well, try seeing accomplishment!
Nash: Is there a difference?