to  dream  is  to  travel,  between  two 
 points.  but,  if  you  wake  up at  the 
 wrong  moment,  you  could end  up where 
 you   aren't   supposed   to  be...   se 
 something  you  wouldn't  want to see... 
                                          
                                          
  
  
  
 things to consider:  
  
  consciousness: do i know things i  
  shoudln't know?  
  actions: do i, or someone else,  
  perform actions that are normally  
  impossible?  
  form: does something look like it  
  shouldn't? is there some kind of  
  anachronism going on?  
  context: am i somewhere where it's  
  impossible to be? how did i get  
  where i am, where were i before,  
  etc.