Narcolepsy, a syndrome of unknown origin is characterised by excessive daytime sleepiness and often disturbed nocturnal sleep and pathological manifestations of REM sleep. From the Greek ναρκωστς meaning to benumb or stupefy, narcolepsy is often called Gélineau’s syndrome, after the French physician Jean Baptiste Edouard Gélineau, who in 1880 gave the first comprehensive description.¹ Westphal described it but more …