o, is there a goddess that fits the bill? I'm guessing probably a few... She was really frightening, wild hair, longish, dark, flicking out around her shoulders, not quite matted or dreds, but not far off. She didn't do anything but I had the impression she was hissing at me like a cat or a goose would. I couldn't see her face clearly because the moon was bright and she was a sillouhette, but I got the impression she was glaring at me.
oh you lucky thing...one of the Dark Goddesses wants you

This kind of thing (not sleep paralysis, but intense, vivid dreaming about a particular goddess) started happening to me about 20 years ago, quite a while before I was ready to come back to being pagan. I didn't know who she was for a long time, but mine turned out to be Kali, the Hindu goddess of destruction and creation. She is *really scary looking in her Dark aspect, and when I first started dreaming about her, I couldn't figger out how something so scary could make me feel so safe and protected and *know me so well. But she does.
I would suggest you do some research of images about Dark Goddesses from a lot of different traditions and see what happens. I can tell you that I was thoroughly gobsmacked the first time I saw a picture of Kali (years after i had been having the dreams and visions, off and on) and went "oh THAT'S the one!!" I have no current affiliation with Hinduism and am not particularly interested in it, although I am starting in a Kali teaching circle next month, I am very excited about that. They call us for Their own reasons.
I am sure She will reveal Herself (whoever She is) to you as you become ready for Her.