Insomnia is a commonly reported comorbidity for adolescents with psychiatric conditions. It is well-known that insomnia can exacerbate the concurrent psychiatric symptom load. Treatment of insomnia has been extensively examined in adults, but studies with adolescents are sparse. The purpose of this pilot study is to assess the feasibility and efficacy of internet-based cognitive behavioral therapy for insomnia (iCBT) in outpatients of Children and Youth Psychiatry. Twenty-one adolescents will be recruited and receive 7 weeks of iCBT. Outcome will be measured at pre treatment, at post treatment and at a three months follow-up. Weekly assessments will also be made during treatment on primary outcome and a presumed process variable constructed for the purpose of this trial.

Inclusion Criteria:

• To fulfill the diagnostic criteria for insomnia
• To have access to a computer with Internet connection
• No previous or ongoing CBT for insomnia
• No psychotropic medication or being on a stable dosage for at least six weeks before enrollment

Exclusion Criteria:

• Ongoing manic or psychotic episode
• Being at high risk of triggering manic or psychotic episode
• Ongoing sleep apnea