Further, we observed an indirect effect of IL‐6 at 9 years in the association between regular sleep routines at 3.5 years and probable ADHD diagnosis at 10 years (β =−.002; 95% CI = −0.003 to −0.001, p = .005; 12.5% of the total effect was mediated by IL‐6 at 9 years); and between higher night awakening frequency at 3.5 years and probable ADHD diagnosis at 10 years (β = .002; 95% CI = 0.001 to 0.003, p = .003; 5.40% of the total effect was mediated by IL‐6 at 9 years) (see Table S4 for the indirect effects). The gene discussed is IL6; the disease is attention deficit-hyperactivity disorder.