Narcolepsy type 1 (NT1) is characterized by profound sleep-wake state instability, pointing to a fundamental dysregulation of large-scale brain network dynamics. To elucidate this, we assessed whole-brain dynamic functional connectivity (dFC) stability using resting-state fMRI in 27 patients with NT1 and 25 matched healthy controls. Our analysis revealed a pattern of opposing alterations: patients exhibited significantly increased dFC stability within the bilateral somatomotor network (SMN), con