Participants will be randomly assigned to one of the five conditions. C1: Sleep Hygiene and Self-Monitoring Control Condition; C2: dCBTi without coaching; C3; dCBTi with virtual coaching; C4: dCBTi with non-therapist coaching; C5: dCBTi with therapist coaching.~Question 1:~Does dCBTi work better than the active control?~Hypothesis 1:~Participants in C2, C3, C4, and C5 will have greater improvement in insomnia than those in C1.~Question 2:~Does coaching support, virtual or human, improve treatment adherence and outcome?~Hypothesis 2:~Participants in C3, C4, and C5 will have greater improvement in insomnia and greater adherence to treatment recommendations than those in C2.~Question 3:~Does human coaching enhance treatment adherence and outcome?~Hypothesis 3:~Participants in C4 and C5 will have greater improvement in primary outcome than those in C3.~Question 4:~Does therapist-coaching-support enhance treatment adherence and outcome to a greater extent than virtual and non-therapist coaching support?~Hypothesis 4:~Participants in C5 will have greater improvement in primary outcome than those in C3 and C4.
The current research aims to evaluate the adherence and efficacy of dCBTi with different types of coaching support.