Statement of Significance
insomnia
SECONDARY, RECRUITMENT
In this randomized-controlled trial, we tested whether digital implementation of cognitive-behavioral therapy for insomnia is an effective treatment in an insomnia population that was not limited by extensive exclusion criteria. Consequently, our recruitment yielded a study sample that was characterised by moderate-to-severe insomnia severity and high prevalence rates of comorbid physical and mental conditions. Clinical evaluation of primary and secondary study outcomes showed robust treatment effects in comparison to a waitlist control group and supports its current use within regular insomnia care. Treatment effects in the intervention group were sustained at long-term follow-up.