Comorbidities, including sleep problems, are common in adult Attention Deficit Hyperactivity Disorder (ADHD). Treatment of choice for insomnia is cognitive behavioral therapy (CBT-i), but evidence is lacking for CBT-i in patients with ADHD and sleep problems.

The purpose of this study was to investigate if patients at a specialist clinic for ADHD benefit from a group delivered CBT-i treatment; whether insomnia severity improves following this treatment.

This pragmatic within-group pilot study with a pre to post and three-month follow-up design was set at a specialist psychiatric out-patient clinic for adult ADHD.

As an adjunct to care-as-usual at the clinic, a CBT-i-based group treatment targeting sleep problems prevalent in the ADHD-population, designed for patients with executive difficulties, was offered as 10 weekly 90-minute group sessions and scheduled telephone support.

All outcome measures were subjectively reported by participants. Data analyzed with dependent t-tests according to intent-to-treat.

Inclusion Criteria:

• being a patient at the clinic (i.e. having a diagnosis of AD(H)D)
• self-reported sleep problems
• returning pre-treatment questionnaires and signed consent form

Exclusion Criteria:

• none