Most of us have been frightened at some time by scary monsters ... is known as a "shadow person", a concept that believers say is a ghost, but scientists attribute to sleep paralysis, when ...

IFLScience needs the contact information you provide to us to contact you about our products and services. You may unsubscribe from these communications at any time.

Sleep paralysis figures in numerous scary films and docu-horrors, including Shadow People, Dead Awake, Haunting of Hill House, Be Afraid, Slumber and The Nightmare. The wildest story Sharpless has ...