A Study to Evaluate the Safety and Efficacy of TS-091 in Patients with Narcolepsy

Inclusion Criteria: 1. Patients diagnosed with narcolepsy type 1 or type 2 based on the International Classification of Sleep Disorders, third edition (ICSD-3) criteria 2. Patients aged ≥16 to \<65 years at the time of obtaining informed consent 3. Outpatients Exclusion Criteria: 1. Patients with sleep disorders other than narcolepsy (e.g., sleep apnea syndrome, periodic limb movement disorder) 2. Patients with organic brain diseases (including neurodegenerative diseases or cerebrovascular disorders) or epilepsy 3. Patients with obstructive respiratory diseases (bronchial asthma, emphysema) 4. Patients with psychiatric disorders (e.g., major depressive disorder, bipolar disorder, schizophrenia)