I was visited by the Old Hag, an hideous looking old woman who's apparently quite common in Newfoundland given reports. This was extremely frightening as I could hear her snickering and evil, twisted laughing as she slowly approached scratching the walls and door with her long nails until she finally peeked around the door scary enough looking to give someone with a weak heart an heart attack when, in a sudden flash of light like time sped up, where she seemingly disappeared and reappeared she had suddenly darted feverlishly across the room and landed on my chest trying to smother the life out of me, it was the greatest struggle to get myself to breathe and fight her off.
Whoa! That is almost exactly, word for word, what my friend has described. I'm not willing to assign supernatural causes to all of this but it is beyond strange how precise accounts of the old hag are from person to person. He also says as she leans over him, right before she jumps on him to try to smother him, she smacks her lips and grins this chilling grin. Your description could have been written by him. That is so creepy!