Participants would be randomly assigned to the experimental or sleep diary self-monitoring (control) group. Participants in the experimental group would use a digital application for seven weeks, whereas participants in the control group would watch psychoeducation videos on sleep hygiene and enter sleep diary measures using the application for seven weeks.~Question 1:~Does dCBTi work better than the active control?~Hypothesis 1:~Improvement in insomnia (immediately after treatment and at 1-month follow-up) would be greater for the experimental group than the active control group.~Question 2:~Does improvement in insomnia due to dCBTi lead to improvement in ADHD outcomes?~Hypothesis 2:~Improvement in ADHD outcomes would be greater for the experimental group than the active control group. The effect of dCBTi on ADHD outcomes would be mediated by improvement in insomnia.~Question 3:~Does improvement in insomnia due to dCBTi lead to improvement in mental well-being?~Hypothesis 3:~Improvement in outcomes related to mental well-being would be greater for the experimental group than the active control group. The effect of dCBTi on outcomes related to mental well-being would be mediated by improvement in insomnia.
The current study aims to evaluate the efficacy and feasibility of a digital application-based CBTi treatment devised for adults with ADHD and insomnia compared to self-monitoring and sleep hygiene control condition.