It was actually a reoccurring dream I had a couple times a week for  about a month.  It was always slightly different but each began with a  creepy little girl with who would tell me a weird riddle associated with  a task I would have to complete and then she would vanish.  Each dream  took place somewhere I could easily recognize as somewhere I had been  before and every time I would be forced to complete some sort of puzzle  that would result in someone dying.  The worst part was there was always  two people that could die: someone I love and a complete stranger.  In  every dream I got the result that ended with the stranger dying and then  the girl would reappear for a brief second with a creepy grin and then  I'd wake up in a cold sweat.  Every time I had one of these dreams I  felt as though I hadn't slept at all and it was extremely draining.   This was a few years ago so most of the dreams are kind of a blur but I  distinctly remember one where I was trying everything I could think of  to prevent anyone from dying but it resulted in me being forced to shoot  a man I didn't know while he was pleading for his life.  It was not a  fun time.