The document provides information about sleep paralysis in 5 paragraphs:
1. It discusses the long history of sleep paralysis and how different cultures have interpreted the experiences, such as encounters with demons or aliens.
2. It defines isolated sleep paralysis (ISP) as the inability to move or talk when transitioning between sleep and wakefulness, accompanied by frightening hallucinations like a malevolent presence.
3. ISP episodes tend to be more common when sleeping in a supine position and usually occur when falling asleep or waking up.
4. Causes of ISP are unclear but may involve genetic and environmental factors. Treatment focuses on reducing stress that can trigger episodes.
5. Some people experience