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Have you ever worked so hard and gotten so stressed that you spaced out and couldn't form any thoughts?
I did this several times a day for the past 3 days while trying to get a website up quickly. I was spending 10 to 16 hours each day and several times my brain just died on me. I found myself staring off into space and unable to form even the simplest of thoughts, it was akin to sleeping except i was wide awake.
My mind was so fried that i even had trouble watching tv show's after (to relax) because i couldn't totally understand what was going on in the tv show.