Global Insomnia Therapeutics Drugs Market By Type (Benzodiazepines , Nonbenzodiazepines , Antidepressants , Orexin Antagonists , and Melatonin Antagonists), By Application (Prescription , and Over-the-Counter (OTC)), By Region, and Key Companies - Industry Segment Outlook, Market Assessment, Competition Scenario, Trends and Forecast 2020-2029