Which scary films and TV shows have kept you awake at night?

http://www.theguardian.com/commentisfree/2015/may/04/scary-films-tv-enfield-haunting

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Did you get any sleep last night? Or did you watch the first episode of new drama The Enfield Haunting? After last night’s premiere of the show – about a family that believes their house is possessed by a poltergeist, based on a true story from the 1970s – viewers took to Twitter to discuss how much it had terrified them, and their fear that they would be unable to nod off. This morning, some returned to social media to report that when they had eventually succumbed to sleep, they’d been awoken by fear.

Which films and TV shows have left you unable to sleep? Is it one of the usual suspects – A Nightmare on Elm Street, Halloween, The Exorcist – or something more unexpected? And were you just sleepless for one night, or has it left you spooked long-term?