“…Cross‐sectional studies show that adolescents who self‐injured also reported sleep difficulties, including symptoms of insomnia (Hysing, Sivertsen, Stormark, & O'connor, 2015; Liu, Chen, Bo, Fan, & Jia, 2017; McGlinchey, Courtney‐Seidler, German, & Miller, 2017). A handful of longitudinal studies partially supported these findings, where sleep difficulties, and particularly insomnia, predicted later engagement in NSSI (Bandel & Brausch, 2020; Junker, Bjørngaard, Gunnell, & Bjerkeset, 2014; Lundh et al., 2013; Wong et al., 2011). However, this link disappeared when controlling for previous psychopathology (Bandel & Brausch, 2018; Junker et al, 2013).…”