The Effects of Transcranial Current Stimulation on Insomnia

Inclusion Criteria: * Clinical diagnosis of insomnia disorder * Cooperate to complete the questionnaire surveys Exclusion Criteria: * Presence of mental disorders * Current use of central nervous system stimulants * Use of analgesics,sedatives or hypnotic medications, theophylline preparations, steroid medications * Alcohol abuse or regular alcohol consumption * Diagnosis of other sleep disorders, including obstructive sleep apnea, rapid eye movement sleep behavior disorder, or restless legs syndrome * Sleep disorders secondary to organic diseases, such as epilepsy, diabetes, or renal failure * Shift work or irregular work schedules that disrupt normal circadian rhythms * Use of medications affecting central nervous system function within the past one month * Recent sleep-related confounding behaviors within the past two weeks, including staying up late, alcohol consumption, or smoking * Presence of organic brain lesions on head MRI and contraindications to MRI examination