Sleeping dogs lend a paw to narcoleptics. While various etiologies for narcolepsy have been explored, some evidence points to the hypocretin neurotransmitter system. Deficiencies in hypocretin secretion or the receptors which detect it have correlated with narcoleptic symptoms. Narcoleptic poodles, Labradors, dachshunds and Dobermans have been shown to have a mutation in the gene coding for the hypocretin-receptor. Canine narcolepsy is considered a close analogue to the human malady. EurekAlert!