Dataset: Insomnia Beyond Emotion Regulation in Adolescent Anxiety and Depression: A Severity-Based Analysis.

Although insomnia also plays a key role in these internalizing conditions, it has received comparatively less empirical attention. Moreover, the extent to which insomnia, above and beyond ER, contributes to anxiety and depressive symptoms at different severity levels remains poorly understood.

A cross-sectional sample of 2,352 adolescents (11–18 years old) completed validated measures assessing ER, insomnia, and symptoms of anxiety and depression. Based on their scores on the Depression, Anxiety and Stress Scales (DASS-21; Lovibond & Lovibond, 1995), participants were classified into four groups: clinical anxiety, subclinical anxiety, clinical depression, and subclinical depression. Within each severity group, hierarchical multiple regression analyses were conducted to determine the unique and incremental contribution of ER and insomnia to anxiety and depressive symptoms, after controlling for age and sex.