I was asleep in my bed about 4:00 am after going to sleep late (maybe midnight), I awoke in sleep paralysis coupled with shooting pain in my head and neck, at first I felt like my head was in the jaws of some large animal, like a puma. The pain was intense across the crown of my head and back of neck, as if something were forcing my spine to be straight while I was being held by a device. I broke free from this device after feeling two injections, one into my spine which left serious pain and the other behind my lower left ear on my neck (offset from the spine), which left me feeling drained. I mustered enough willpower to wrench myself free from the vice grip and turned to see an entity with black skin and speckled all over with silver (the entity was at least 6-8 feet tall, but was hunched over so height was not easily determinable, it felt larger than me and left a predatory aura of menace)- its eyes were speckled with silver swirls, reminding me of a chameleon's lidded eyes but conveyed the impression of swirling galaxies. The black skinned entity had long arms with an extra joint between the wrist and hand area. The entity made a loud noise as if surprised that I had wrenched free from the vice or device it had used on me, the sound was a deep throated noise that was similar to "Urrruck". It didn't seem to be telepathic communication or anything, just a loud noise it made. Then it suddenly seemed to grow hazy and vanish. By this point I was fully awake and terrified. I felt a terrible menace in my darkened house, with only a faint kitchen light. I felt or somehow knew, the entity was still here, waiting for my body to grow tired and me to fall asleep again. I forced myself out of bed and began searching my house, flipping on lights in every room as I did so. I found my kitchen and bedroom/bathroom empty. I still felt pain from my back, shoulder, neck and head that persisted. Fueled mostly by adrenaline I entered my sitting room and suddenly felt a spot of cold behind my couch and my hairs all stood on end. I began to check the entryway door to my house and suddenly I heard the sound of both my backdoor and my front door slamming loudly and simultaneously. I opened the door fast to see if I could catch someone or something running away, but found that my front door was locked. I ran immediately to the back door and discovered the same thing. I don't know if this was due to some sort of temporal anamoly or an ability to pass through solid matter, but I was fully awake and very terrified by that point. I went out the back door and looked up into the sky, the stars were out and light cloud cover, with clouds racing on the wind. Only one cloud was not moving and it had a round hole in the cloud cover - nothing seemed to be there but it was perfectly circular. I couldn't say how high up above the house it was, but it seemed close (