Clinical Research Directory

Inclusion Criteria: * Meets diagnostic criteria for insomnia disorder according to the International Classification of Diseases, 10th Revision (ICD-10), including: F51: Nonorganic sleep disorders; G47: Sleep disorders * Has experienced insomnia symptoms for 3 months or longer. * Scores 8 or higher on the Insomnia Severity Index (ISI). * Oral and written fluency in Korean * Owns a smartphone and is independently able to use apps on a smartphone. * Voluntarily agrees to participate in this clinical study and provides signed informed consent. Exclusion Criteria: * Currently receiving non-pharmacological treatments for insomnia (e.g., CBT-I, light therapy, traditional medicine for sleep) within the past 3 months from screening. * Diagnosed with other sleep disorders aside from insomnia and currently symptomatic, such as: * Obstructive sleep apnea (G47.30) * Sleep behavior disorders * Restless leg syndrome (G28.8) * Narcolepsy (G47.4) * Has an active, ongoing physical illness that impedes daily functioning, such as: * Congestive heart failure * Chronic obstructive pulmonary disease (COPD) * Acute pain * Neurological disorders (e.g., cerebrovascular disease) * Neurodegenerative disorders (e.g., dementia, multiple sclerosis) * Unstable medical conditions or life expectancy of less than 6 months * Adjustments in schedule or dosage of sleep medications, antidepressants, anticonvulsants, anxiolytics, or antipsychotics within the past 3 months, or use of PRN (as needed) prescribed sleep medications. * Engaged in shift work. * Pregnant individuals or those planning to become pregnant during the study period. * Any condition that the investigator believes would make participation in the study not in the best interest of the participant or would preclude successful completion of study activities