I may have encountered a ghost once, and it left the room I had just entered. Years ago, it was my job to deliver horse racing newspapers to a publisher in Northern Ohio. I always delivered at 3a.m. when no one was there. I had a key. It was always very quiet and 'spooky'. One time I noticed movement outta the corner of my eye as I approached the glass entrance door. I was so sure I had seen something, I yelled out;"hey you". I went inside and searched around but found no one there. Later, I was making a day delivery there and mentioned my experience to the manager. She told me about seeing a woman ghost in a wedding dress was a common sight amongst the employees. The building had once been a funeral home.
Mine does. He/she (i suspect its a he) sits on my bed sometimes , leaving a little dent in the mattress. I think he/she must be staring at me. He/she also tugs on the covers sometimes, I suspect they must be thin skinned.
What if they're actually humans from another dimension and we look like ghosts to them in our dimension? Maybe sometimes there's a little rip in space and that's when the "ghosts" appear? Or maybe we're actually the ghosts and still think we're living and the ghosts are actually living humans?