Global Narcolepsy Therapeutics Market By Type (Central nervous system stimulants, Sodium Oxybate, Selective Serotonin Reuptake Inhibitor (SSRI), and Tricyclic Antidepressants), By Application (Narcolepsy With Cataplexy, Narcolepsy Without Cataplexy, and Secondary Narcolepsy), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2019-2028