Purpose <p>This study aims to evaluate the acceptability and feasibility of a telehealth-delivered Cognitive Behavioural Therapy for Insomnia (CBT-I) intervention delivered for undergraduate students in Saudi Arabia, and to explore its potential effects on sleep and mental health outcomes.</p> Methods <p>A single-arm design study was conducted. Fifteen participants were enrolled in the study, and nine of them completed baseline, post-intervention and one-month follow-up measures. Outcome measures included actigraphy monitoring, sleep-related questionnaires, and mental health variables, including depression, anxiety, stress, and resilience.</p> Results <p>The findings indicated that recruitment and retention rates were high, and participants reported high levels of satisfaction with the intervention. Moreover, participants demonstrated good compliance with the sleep intervention by following healthy sleep routines and applying the sleep toolbox, as well as cognitive and relaxation techniques. In addition, this study also investigated the possible association between improvements in sleep, mental health related to depression, anxiety, stress and resilience scores at baseline, post-intervention and follow-up.</p> Conclusion <p>Given the high prevalence of sleep disturbances among undergraduate students in Saudi Arabia, this study contributes to the emerging evidence that telehealth cognitive behavioural sleep interventions may be both feasible and acceptable in this population.</p>