I just know I had a few bad dreams, won't call them nightmares where I was in a situation where some people were threatening my dogs life and I was defending him. Woke up and quickly found the furry friend to give him a hug. An outright nightmare... I'd have to go back to college during exam week, end of 2nd semester. I had a mirror hanging in my room on the back of my door and I was on the bed taking a nap after studying for a few hours. I found myself having trouble moving my muscles / body parts, including head, which was a sort of problem as I was face down on half of my pillow. So I could breathe but not all that well. And I wasn't able to shake free of whatever had taken over my body, I couldn't move. To add to the terror I began to feel, I rmemeber looking with my eyes, as my head was stuck, behind me somewhat and seeing a dark shadow I'd say, walking towards me out of the mirror. And the final terrifying detail, I heard what sounded like horse hooves, clip clapping on the hardwood floor of my college dorm. Holy fuck.... I felt like I was being taken over or possessed. I heard laughter or cackling amongst the clip clopping of the horse who seemed to be walking around my tiny college dorm. Finally I began to have bodily control return to me and the shadowy figure and noises slowly faded. I learned later this is sleep paralysis and the people who talk about it make it seem like "everything's normal!", but wtf. I don't trust the reasons behind it.