Nightmare disorder is believed to be associated with Dissociative Disorders as a defense mechanism that is used to escape from the traumatic event that caused the Dissociative Disorder. People with Dissociative Disorder and Nightmare disorder are more likely to self-mutilate, attempt suicide, and have Borderline Personality Disorder.[9] Borderline Personality Disorder with Nightmare Disorder is very common, since the stages of sleep vary from that of a normal person (i.e. increased stage one sleep, and less stage four sleep). People with Borderline Personality disorder and Nightmare Disorder are usually the severest of those who have Borderline Personality Disorder; therefore, treating those with Nightmare Disorder may also help some with Borderline Personality Disorder.[10] Hypnosis seems to be a new and effective treatment for those with Nightmare Disorder, since it increases relaxation.[11] Nightmare disorder is also associated with those who have lower cholesterol.