E-aid Cognitive Behavior Therapy for Insomnia to Prevent Transition From Acute Insomnia to Chronic Insomnia in China

Inclusion Criteria: * Clinical diagnosis for acute insomnia according to the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5); * Must be eighteen years or older; * Must be able to comply with the intervention; * Must be able to provide informed consent; * Owning smart devices (such as smartphones and tablets). Exclusion Criteria: * A significant untreated mental or medical illness (e.g. consciousness disturbances, mania, acute phase of schizophrenia, major depressive disorder); * Received any kind of psychological treatment for insomnia in the past 6 months; * Shift workers, frequent cross-time flyers (e.g. shifted nurse/health professionals, international flight crew). To allow for greater generalisability, this study does not exclude patients with a stable condition of somatic disease, mental disorders (eg, depression in remission), or individuals receiving pharmacological treatments (eg, antihypertensive drugs, antidepressants and benzodiazepines).