You came to the right place kris many of us experience things similar to what you describe, just yesterday I kept seeing bugs crawling, except there are no bugs in my room... Think I'm just a tad stressed though, so they don't bother me much, not to mention I'm a bit too used to seeing and hearing things that obviously don't exist.

Don't be scared, like Moose said, they can't harm you, hope the experience isn't repeated, I can see how disconcerting it is for you.