Sleep paralysis is common, and rarely harmful, though it can be scary. Here's what you should know about the causes, risk ...

Sleep paralysis seems absolutely terrifying—when your limbs stay paralyzed after you've woken up from sleeping—but it's common and not dangerous. One expert shares simple ways you can make the ...

Known as the Hat Man, this tall, dark, featureless character has been seen by people in their bedrooms, watching over them ...

(CNN) — 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, experiencing his own real-life horror ...

When a person is asleep, their core body temperature drops. Heart rate and breathing also slow down and overall metabolic activity decreases by about 10%. A sleeping body may seem inactive at first ...