List of products in the National Drug Code with proprietary name . This medication is used to treat a certain sleep problem (insomnia). It may help you fall asleep and stay asleep longer, so you can get a better night's rest. Suvorexant belongs to a class of drugs known as sedative-hypnotics. If your insomnia continues for longer than 7 to 10 days after starting treatment, talk to your doctor to see if you need other treatment.