My college roommate once sat up in the middle of the night when I was pulling an all-nighter and started patting the bedding, asking, "Where's my chain?" and I assumed she'd lost a necklace she wore all the time or something and walked over toward the bed asking her, "What chain?" and she kept saying/doing the same thing and then laid down and was "out" again and I realized she'd been asleep all that time but it was like she'd been dead and had risen from the dead, LOL, gave me the willies; like Scrooge's partner, Marley!