Following a request for help on the RiPA forums regarding 'Shadow People',I feel that a brief rundown on explanations would be in order.
As with most supernatural phenomena there is usually a proposed logical, scientifically valid explanation for those who claim to have experienced some form of paranormal phenomenon. Usually these scientific explanations are neither geared to vilify eyewitnesses, nor do they require the violation of generally accepted scientific principles.  However, for some ...

"The light had been switched off, and a comfortable feeling of warmth and heaviness marked the onset of sleep. But suddenly a slurping sound startled the sleeper. Everything seemed completely normal – until he noticed the green liana which had grown from the pot plant and reached his body.

"Every movement became impossible, and every scream was smothered by the plant material that was growing around his mouth and throat. Thoughts raced through the mind: This wasn't a nightmare, the realit...

This is a fantastic article, courtesy of C. French, going into detail about sleep paralysis, sometimes confused with the 'Old Hag' syndrome.

My eyes are open and usually I get the sense that something in the room is happening, so it’s more like apprehension. It’s a sort of belief that something’s going to go off and then a shape gathers, a sort of black, small black cloud gathers and it’s the devil… a monster. And it comes onto me and I can feel its weight and basically the belief is...