Why do my mind flashes things that are not there?

My mind have been flashing things for years.Its really crazy and weird.It often happens when i'm tired.You may say i'm hallucinating but no.I'm not,it sometimes happen when i'm calm too.When my friend told me his location and don't know where that is,i searched it in google,and my mind flashes 'USA'.I tried to find it over the screen but there's no USA in there,but it was right.And second,my mind flashed a date.May 5,2015.I don't know what will happen.So,if you guys have any idea,please tell me.Its starting to get weird.
Asked Apr 29, 2015

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