“Slenderman” sightings in the UK have prompted paranormal investigation.. reports of an 8-foot man haunting people, causing sleep paralysis.. The term ‘slenderman’ came from a Creepypasta a few years back, but the notion of a tall slender man with a pale white face has been in culture for centuries. What is strange about this is how many similar stories of this type of man are suddenly coming from the UK mining town of Staffordshire..