Training of professionals in cognitive behavioural therapy for insomnia - A systematic review of peer-reviewed studies.

Insomnia is common, and causes substantial individual suffering and costs for society. The recommended first-line treatment is cognitive behavioural therapy for insomnia (CBT-I), which is under-used partly due to a lack of trained providers. To train providers is thus important, but what is the current situation regarding CBT-I training? A systematic search of databases was conducted to identify scientific peer-reviewed papers describing CBT-I training with regards to: existing amounts of training, proposed curricula, trainees, delivery context, content of training, modes of delivery, evaluation of the training from a trainee perspective, and effects on patients. This systematic review shows that research on training in CBT-I is an emerging field, with the literature presenting a limited number of papers, with varying objectives. One group of papers investigate the amount of training that exists in a region or educational context and/or propose training curricula; and another group evaluate training initiatives and describe CBT-I training trainees, context, content, modes of delivery, and outcomes on trainees and on treated patients. The studies show that little training is currently provided and proposed curricula vary, and evaluations present promising results: training is feasible in different contexts and modes, digital training may be used to disseminate training efforts at a large scale, trainees' skills increase and positive effects on patients can be seen. To move the field forward, more high-quality studies on CBT-I training are needed, and we propose that training in CBT-I should be targeted towards varying levels of expertise, matching a stepped-care model.