There were no other EDS-causing factors, such as sleep insufficiency, SAS, periodic limb movement disorder, delayed sleep-wake phase disorder, drugs, or similar factors.[8] The diagnosis of narcolepsy type 1 is based on the presence of cataplexy, shortened sleep latency, and 2 or more SOREM periods on the MSLT or a CSF orexin level ≤ 110 pg/mL. This evidence concerns the gene HCRT and periodic limb movement disorder.