I had a really cool dream once. I was a lady living in the mid 1700's. My husband was rich, but I didn't love him one bit. I ended up having a brief, emotionless affair with the young guy that worked in the stables; my hubby found out and strangled me to death.
Then I ended up being a ghost, haunting my old house. I was very bitter and angry, as I'd had a life without happiness or love. When a young couple (present day) moved into the house, I became obsessed with the man, following him from room to room, trying unsuccessfully to communicate with him. I would touch him, but he just kept thinking he'd walked into a cobweb. I'd stand in front of him, screaming his name, but he just thought it was the wind rustling the leaves.
His wife, however, was well aware of my presence, and kept telling me to go away and leave them alone. So I started doing poltergeist-type stuff to frighten her. It turned into an all-out war between us, and the husband had no idea any of it was happening.
When I awoke from this one, the furnace had ceased working and the room was freezing cold; four cats had crawled into bed and were lying all over the top of me. I wonder if that influenced the dream I had.