I have experienced moments of confusion, like being on a business trip and waking up in an unfamiliar place and needing a moment to orient myself.  One time (or possibly more than once), I forgot where I parked my car at a large shopping mall.  With so many entrances to choose from, I could not remember which one I walked through to enter the mall.  Just a few weeks ago, I went through half of a day believing it was Thursday, and it was Wednesday- an entire HALF DAY!