I Saw a Woman Dissolve
I was in Washington DC almost a decade ago and had gone to bed somewhat early (about midnight-ish) since I had an event to be present at around 9 am. I woke from a dead sleep, around 3 am or so. I looked to the right side of the room and saw a woman in a long, flowing, white dress peering out the window. She then turned to the left and flowed to the other side of the room and dissolved.
I was too groggy to actually piece what I had seen until I got home and thought about it. I wish I had remembered the hotel I stayed at so I could do research on it and figure it all out.
Story credit: Reddit / Thecrdbrdsamurai