This document discusses insomnia, specifically issues with sleeping alone. It defines insomnia as difficulty falling or staying asleep. People may have insomnia for many reasons, such as nightmares, psychological fears of something watching them, or believing in ghosts. Insomnia related to sleeping alone can be transient (less than a week), acute (over a month), or chronic (over a month). Symptoms of insomnia when sleeping alone include staying up late alone, avoiding sleeping alone, and using strategies like leaving lights on or surrounding oneself with toys to feel safe. The document provides examples of how insomnia from sleeping alone feels and techniques people use to manage the fear.