The relationship between insomnia and non-suicidal self-injury(NSSI) among college students: parallel mediation effect of subjective well-being and rumination

To explore the relationship between insomnia and non-suicidal self-injury (NSSI) among college students, and to examine the mediating roles of subjective well-being and rumination. A questionnaire survey was conducted with 667 university students from Jiangsu Province using the Athens Insomnia Scale, Adolescent Self-Injury Scale, World Health Organization Well-Being Scale, and Ruminative Responses Scale. The prevalence of NSSI among university students was 34.03% (227/667). Insomnia was significantly positively correlated with rumination and NSSI(r = 0.686, 0.400, P < 0.001), and negatively correlated with subjective well-being (r =-0.331, P < 0.001). Rumination was significantly positively correlated with NSSI (r = 0.410, P < 0.001) and negatively correlated with subjective well-being (r =-0.271, P < 0.001). Subjective well-being was significantly negatively correlated with NSSI (r =-0.350, P < 0.001). Insomnia is a positive predictor of NSSI, and it indirectly influences NSSI through its effects on subjective well-being and rumination.