SUICIDE IS A SIGNIFICANT PROBLEM IN THE UNITED STATES. HERON ET AL.1 REPORT THAT SUICIDE WAS THE 11TH LEADING CAUSE OF DEATH IN THE UNITED

States in 2006, accounting for 33,300 deaths. Although the etiol-ogy of suicidal behavior appears to be complex, steps toward understanding it can be made through the identification of sui-cide risk factors. Although over 90 % of individuals who die by suicide have a mental disorder at the time of their death,2 the vast majority of people with mental disorders do not die by suicide. Thus, identifying risk factors beyond mental disorders may help in determining who is at the highest risk of suicidal behavior. A growing empirical literature has examined insomnia symptoms as a possible risk factor for a range of suicidal be-havior, including suicidal ideation,3 suicide attempts,4 and death by suicide.5-7 Several studies have also found a relation between nightmares and suicidal behaviors.8-10 However, few studies have examined whether nightmares or insomnia symptoms are related to suicidal ideation and behaviors independent of psy