Typical sleep disturbances during NREM and REM sleep, including stridor and obstructive sleep apnea, snoring, insomnia and limb movements during sleep, associated with antibodies targeting the extracellular domain of the IgLON5 immunoglobulin‐like cell adhesion molecule, were described as the first hallmark of anti‐IgLON5 disease.1, 2. This evidence concerns the gene IGLON5 and insomnia measurement.