Answer to Question 1
Although many people complain of poor sleep, most do not take prescription medications for this. Both benzodiazepine (e.g., Halcion) and non-benzodiazepine (e.g., Ambien) drugs are typically used. Concerns include dependence, respiratory depression when combined with alcohol, and people driving, walking around, etc., while still under the drug's influence (sleepwalking).
Answer to Question 2
GHB was sold as a dietary supplement and used to stimulate muscle growth. In high doses, GHB has alcohol-like effects, and its recreational use led to banning it from dietary supplements in 1990 . Its use as a date-rape drug led Congress to direct that GHB be placed on Schedule I in 2000 . In 2002, a prescription version (Xyrem) was made available for treating narcolepsy. Xyrem is on Schedule III.