It just seems to be shadows at times in the corner of my eye and not all the time. I used to work overnight at a hotel and during my rounds I would always get a creepy feeling in the ballroom and often get goosebumps and see shadows. It always scared me because I was alone and well..it was creepy! I would always look right away in the direction and see nothing. It very well could have been my imagination running away with things...but...I do believe in spirits. :)