I can't answer the question but years ago, Harvard Magazine did a short article on the anxiety dream relating to taking a test unprepared, showing up for the exam naked, not being able to find the exam room, etc..there were letters on this subject sent to the editor for months until, finally, the'zine staff said "Enough." Apparently, everyone has them, in various versions, over and over..I have the train one ...missing it, getting off at the wrong stop, forgetting where I am going.