IGLON5 and Sleep apnea: Sleep apnea was reported to be typical to AIE associated with anti-IgLON5 antibodies [13, 16], though snoring, gasping or witnessed apnea were also reported in other types of AIE, such as in association with anti-AMPA antibodies [3], anti-DPPX antibodies [17], or in association with anti-LG1 antibodies, as demonstrated in our study.