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Well, I work as a virtual assistant and many times my clients are transferring to me things that they do not want to think about (= travel arrangements, expense receipts, meeting arrangements, invoicing, paying bills, excel work, customer service etc.) So I'm giving out a huge amount of my thinking capacity and honestly, I feel lots of time dumb as my mind is just tired and I can't process thoughts. So I can relate to people who are tired because of work or family and work combination.