A still from an upcoming short film on sleep paralysis by filmmaker Carla MacKinnon about sleep paralysis, a phenomenon where people wake up with frozen muscles and, often, scary hallucinations.

Imagine waking up in pitch darkness paralyzed from head to toe. You try to scream but can’t. Suddenly you realize there is a ghost with bloody fangs hovering over you. Before you know, the creature ...

What are sleep paralysis demons? Sleep paralysis demons are nightmarish hallucinations that often accompany episodes of sleep paralysis. This occurs when the temporary paralysis, which is a normal ...

Sign up for CNN’s Sleep, But Better newsletter series. Our seven-part guide has helpful hints to achieve better sleep. Baland Jalal lay in bed terrified ...

Dan Denis receives funding from an Economic and Social Research Council (ESRC) Advanced Quantitative Methods PhD studentship. He is also the researcher for The Sleep Paralysis Project “I awake in bed ...

This article by Theresa Fisher originally appeared on Van Winkles, the publication devoted to sleep. Annalia first heard the creature slip into her bedroom when she was six years old. It — whatever it ...