Clinical Research Directory

Inclusion Criteria: * older adults aged ≥ 60 years * Subjective cognitive decline questionnaire 9 (SCD-Q9) ≥ 5 * Montreal Cognitive Assessment (MoCA) ≥ 26. If the number of years of education is less than 12, one point will be added to the total score; * with insomnia according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5) and Insomnia Severity Index (ISI) ≥ 8 * reachable by phone Exclusion Criteria: * having a previously diagnosed primary sleep disorder, such as sleep apnoea * suffering from a severe chronic illness that could contribute to sleep problems (e.g., emphysema) * currently undergoing medical, psychological, or psychiatric treatment for sleep disturbances or depression * having significant visual or hearing impairments.