Chung et al. [9] reported the co-existence of IgLON5 and GABABR antibodies in an AE patient who presented predominantly with typical IgLON5-related symptoms, including a severe sleep disorder, gait instability, dysarthria, and recurrent visual and acoustic hallucinations, but without the distinctive features of GABABR-related symptoms of limbic encephalitis. Here, IGLON5 is linked to sleep disorder.