What it says on the title. Mine was when I was 12 and I lived in a very haunted house which had some weird activity going on, like things moving out of place and pets freaking out. I was sitting in the computer, alone in the house, and suddenly I see a shadowy figure on the screen, just some meters away behind me, thinking was my mom I turned around and there was nothing, but the room had turned extremely cold suddenly. There was nothing behind me that could have been this shadow.
She was standing in the air above your bed? Just trying to picture it properly.
I guess a better way to describe it was that she was at the foot of my bed. I was walking back into my room from the bathroom, and I see her in the moonlight. As she turned to look at me, she just faded into nothing.