This happened when I was very young around 7-11.
My old house was very odd and spooky. It had 5 floors and was surrounded by woods. I was asleep in bed and my mum's cat was on the bed as well.
In the early hours of the morning between 2am to 4am I was awoken by my cat clawing my arm. I looked into the corner ceiling of my room to see a floating woman. She wasn't in full size. I could see her gown, her face and her grey flowing hair. She spoke to me and said "get out of my bed".I'm pretty sure her lips didn't move at the time but I am not 100% sure. I told her to shut up and went back to sleep.
When I woke in the morning I ran into my mother's room a little confused. I asked her who owned my bed. She told me it had belonged to my great gran. I asked my mum if she looked like the person I had seen during the night and my mother was confused and replied "yes". She was confused because I had never met or seen the great gran. Weird or what?
My mum's mother also had a visit from the great gran (the great gran being related through my dad's side). My Nan said she had sat at the end of the bed, and looking back now I can remember being really young and feeling the bed springs reacting oddly at different times.
This isn't the only thing to happen in a strange way in my old house.