Software-delivered CBT-I for Insomnia Disorder

Inclusion Criteria: * Aged ≥18 years old, no gender limitation; * Own a mobile-phone, access the Internet, and be skilled in using software; * Meet the diagnostic criteria of insomnia disorder in the Diagnostic and Statistical Manual of Mental Disorders (Fifth Edition) (DSM-5); * Insomnia symptoms appear at least 3 nights per week and last for at least 3 months; * ISI scores ≥ 12 ; * Volunteer to participate in this experiment and sign a written informed consent. Exclusion Criteria: * Generalized Anxiety Disorder Scale-7 (GAD-7) scores ≥ 15; * Patients Health Questionnaire-9 (PHQ-9) scores ≥ 20; * Current thoughts of suicide or self-injury (defined as PHQ-9 9th item score ≥ 1); * Confirmed physical diseases that may affect sleep, such as congestive heart failure, chronic obstructive pulmonary disease acute phase, cardiovascular and cerebrovascular disease acute phase, etc. * Current diagnosed neurological or mental illness (major depressive disorder, bipolar disorder, epilepsy, schizophrenia, etc.) that may affect sleep; * Diagnoses of other untreated sleep disorders, such as obstructive sleep apnea, restless leg syndrome (RLS); * Usual bedtime (when the subject attempts to fall asleep) is earlier than 8 p.m. or later than 2 a.m., or usual waking (arising) time is earlier than 4 a.m. or later than 10 a.m. * Alcohol or drug abusers (other than nicotine dependence) in the past year; * Pregnant or lactating women; * Undergoing systematic psychotherapy within the past 3 months; * Undergoing other cognitive behavioral therapy for sleep disorders; * Unstable usage of medication regimens that affect sleep (changes in type, dosage and method of use within the past 1 month); * Night shift workers, travelers across time zones; * Subjects who have not responded to previous CBT-I; * Other conditions deemed unsuitable for clinical trials by the investigator.