Ephialtes.

About Ephialtes

Ephialtes is an anxiety disorder identified as such by John Bond in 1753, along with other authors of those times, in his treatise "An Essay on the Incubus, or Nightmare". The famous Greek physician Galen in the 2nd century AD had already named nightmares "Ephialtes". Throughout history, sleep paralysis and the similar term nightmare have been widely accompanied by mythological creatures with paranormal powers.