Title: Weaving a terrible dream
Description: Nightmares are a common experience; on average, most people have one approximately every ten to twelve days. However, 4-5% of people report having frequent nightmares, defined as more than two per month. Frequent nightmares are a symptom of posttraumatic stress disorder (PTSD); additionally, they have been linked to increased life stress, increased risk for suicide, schizophrenia, and with "thin boundaries," a trait marked by altered states of consciousness. However, past research has focused exclusively on individuals with PTSD or individuals exhibiting thin boundaries and has not yet compared the two groups. Additionally, research has also shown that some psychological states correlate with a specific linguistic pattern marked by especially high or low use of words in a particular category. However, the linguistic analysis methodology has not yet been applied to dream content.In this study, I address three main research questions: Are frequent nightmare sufferers with and without PTSD vastly different or do they share some of the traits identified by previous researchers? What traits correlate most strongly with nightmare frequency, aside from PTSD? Does dream content differ between nightmare sufferers and those who do not have nightmares?

Eighty-three participants completed questionnaires related to a variety of psychopathological and personality traits and recorded their dream content over a two-week period. Results showed that frequent nightmares were associated with psychopathological symptoms, neuroticism, disturbed sleep, and thought suppression. Additionally, after controlling for PTSD, I found that psychopathological symptoms, dissociation, and thought suppression accounted for approximately a third of the variance in nightmare frequency. Individuals with frequent nightmares also used more words related to anxiety and fear, death, and the body than did those without nightmares. This study identifies traits that correlate with frequent nightmares and that may increase vulnerability to frequent nightmares, as well as offering insight into the ways in which language is used to describe dreams. Limitations of the study include a small, homogenous sample, retrospective reporting on nightmare frequency, and difficulty identifying nightmares based on dream content reports. Future directions include collecting nightmare data prospectively, including a measure of life stress, and examining dream content along a broader range of linguistic dimensions.