Concurrent and Longitudinal Associations Among Insomnia Symptoms, Internalizing Problems, and Chronic Pain in Youth

Objective: Although insomnia symptoms and chronic pain are associated, less is known about the temporal nature of the associations between these variables or the impact of internalizing symptoms on the associations. Concurrent and longitudinal associations were examined among insomnia symptoms, internalizing symptoms, and pain in youth with chronic pain in this retrospective analysis of clinical records. We hypothesized the following: (a) pain, insomnia symptoms, and internalizing symptoms would be significantly interrelated at all waves, (b) insomnia symptoms would more strongly predict future pain than the reverse, and (c) internalizing symptoms would mediate the longitudinal association between insomnia symptoms and pain. Method: Youth (N = 132; age M = 15.34 years, SD = 1.86 years) were assessed at their initial and two subsequent appointments (time between appointments M = 6.48 months, SD = 4.43 months). At each appointment, youth reported their pain severity, insomnia symptoms, and internalizing symptoms. Confirmatory factor analyses (CFAs) and cross-lagged panel models using structural equation modeling were conducted. CFAs and the cross-lagged panel model with pain and insomnia symptoms as latent constructs converged. Results: Pain and insomnia symptoms were positively correlated within each wave. We found bidirectional longitudinal associations between insomnia symptoms and pain. Conclusions: Overall, these data demonstrate a bidirectional relationship between insomnia symptoms and pain, as well as weak support for internalizing symptoms mediating the association between pain and insomnia symptoms. Treatment of youth with chronic pain should prioritize concurrent or early treatment of comorbid insomnia symptoms to maximize response to pain treatment.