2022). This holds true more often than not, but is not to say that cataplexy cannot, and does not, present at any age. The loss of hypocretin, produced from the hypothalamus, has been identified as a main contributor to the development of narcolepsy (Mignot et al. 1997). It has been presumed that an immune‐mediated destruction of neurons producing hypocretin occurs, and is linked to an HLA subtype identified as DQB1*0602 (Vaarala et al. 2014). This evidence concerns the gene HCRT and Cataplexy.