“…Frequent nightmares are a risk factor for suicidal thoughts and behaviors (Li et al, 2010;Pigeon, Pinquart, & Conner, 2012;Sjostrom et al, 2009), and suicidal thoughts and behaviors are also sometimes contagious, e.g., in 'copycat' suicides (Jeong et al, 2012;Yang et al, 2012). Self-injurious behaviors are similarly associated with both nightmares (Wong, Brower, & Zucker, 2011) and contagion (Jarvi, Jackson, Swenson, & Crawford, 2013). Thus, there may be an underlying tendency to imitate others among self-harming individuals, which is consistent with the possibility that there is an underlying voluntary and involuntary tendency to imitate others' behaviors among suicidal individuals.…”