Various narcoleptic episodes in dogs. Sporadic cases of narcolepsy in dogs is due to hypocretin peptide deficiency while the familial form is due to mutations in one of the two hypocretin receptor genes (hcrtr2). Various dogs are shown here in a clip narrated by Dr. Emmanuel Mignot. This clip was provided by The Center for Narcolepsy at Stanford School of Medicine. For more information on sleep and sleep disorders, visit the National Sleep Foundation at www.sleepfoundation.org