That is very interesting!  I had my own experience at a hospital.  I had gone in for surgery, when I was twelve.  It was a fairly serious surgery and I was there for 2 or 3 weeks.  Anyway, shortly after my surgery I woke up to find my bandages had fallen off my head.  I called a nurse but no one responded.  o I got up  and walked out of my room looking for someone to help me.  And then out of no where a nurse was helping me.  Taking me back to my bed.  I remember that she had one of those hats on...  Anyway, she took me back to my bed, and said she get someone to help me.  I was only 12, I didn't think "Well why don't you help me, you're a nurse..."  A few minutes later another nurse came in, and I asked her who was the other nurse and she said, there was no one else but her at the moment. 
It was only years later that I heard on the news that there was a reported  "ghost nurse". It kinda spooks me out now, but at the time, it was so ordinary.