What is Sleep Paralysis?

Sleep paralysis is a temporary inability to move or speak that happens as someone is falling asleep or waking up, sometimes accompanied by vivid, frightening hallucinations or a sense of pressure on the chest. It happens because the natural muscle paralysis that occurs during dream sleep briefly persists into a waking state.

While frightening, sleep paralysis is not dangerous and usually lasts only a few seconds to a couple of minutes. It's fairly common, especially in people who are sleep-deprived, under stress, or have irregular sleep schedules, and typically improves by addressing sleep habits.