The creepy science behind sleep paralysis 'demons'

Aliens, vampires, and ghosts have haunted our sleep for centuries. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. In 1781, Swiss artist Henry Fuseli painted this piece entitled The Nightmare. Sigmund Freud had a copy of the painting hung up in his Vienna apartment in the 1920s. Have you ever woken up in the dead of night to find your limbs locked tight?