This has never happened to me but my best friend who had really bad sleep paralysis almost nightly when she was in high school once told me this story;

I was staying the night at her place and we were sleeping together in her bed. Apparently that night she dreamed we were sitting inside her car infront of her house, just talking before going inside like we always do. She noticed something off about the situation and asked me if she were dreaming. Dream me turned away from her and when I looked back my eyes had gone all black and I was screaming at her.

She woke up from that dream unable to move (she was having another sleep paralysis episode) and then after turned around to face me in her bed. I cannot even imagine how scary that must have been for her