Narcolepsy is a disorder characterized by sudden, uncontrollable, and often brief attacks of sleep, sometimes accompanied by paralysis and hallucinations. Its cause is unknown, it has no cure, but it is fairly common—the US alone is home to some 200,000 narcoleptics. People with narcolepsy may abruptly fall asleep at any time, including while talking or even walking. The attacks can range from embarrassing and inconvenient to severely disruptive of daily life. How is narcolepsy diagnosed? Discuss