Participants in the intervention arm will be offered nurse-delivered insomnia therapy in the form of SRT, a manualized behavioural intervention. See online supplementary table 1 for a detailed description of the intervention according to the template for intervention description and replication (TIDieR) checklist. We will initially aim to train practice nurses to deliver SRT but in order to overcome scheduling issues that may arise, or limitations on practice capacity, we will also train research nurses from clinical research networks to support delivery. Nurses will receive a 4 hour training session on insomnia and the delivery of SRT as well as access to supporting resources (eg, recorded video clips and a list of frequently asked questions and answers in relation to treatment delivery).