What is narcolepsy? Narcolepsys a type of sleep disorder where somebody becomes unable to properly regulate their sleep-wake cycles. Subscribe .\rbr\rbrIn narcolepsy, the immune system destroys certain brain cells that produce a peptide called hypocretin mar 10, 2015 study suggests narcolepsy disorder begins .\rbr\rbrIn narcolepsy, the immune system destroys certain brain cells that produce a peptide called hypocretin mar 10, 2015 study suggests narcolepsy disorder begins .\rbr\rbrDr. Douglass is a psychiatrist and also a fully-qualified specialist in sleep disorders medicine. During over 30 years of practice, he has assembled a series of .