posted on Jun, 28 2013 @ 04:33 PM
Although it's very unsettling, rest assured there are possible scientific explanations.
As a young child and woman, I would have encounters famously known as 'the hag' upon waking. People all over the world for thousands of years have
recorded 'waking sightings' including Incubu/Succubi, aliens, demons, ghosts, miscellaneous creatures, etc.
It is related to the phenomenon of sleep paralysis.
It can still cause one to be startled, though.