It sounds like the start of a horror film: a shadowy figure at the end of your bed, a faceless presence sitting on your chest ...

Maybe you’ve seen the meme: “This is my sleep paralysis demon: [insert photo].” The viral idea builds on a very real condition in which a person is conscious but unable to move. In some cases, people ...

It’s the stuff of nightmares. You wake up, and you can’t move your body. A shadowy figure looms over you, but it feels too real to be a dream. If you’ve experienced this, you might have had a sleep ...

Most of us have had nightmares involving scary monsters at some point in our lives. But that fear pales in comparison with the seemingly real mysterious and menacing figure who has people around the ...