“If you have a question about buying Restoril online?” Restoril is a Benzodiazepine .Restoril is used to treat sleep problems(Insomnia).Usual Adult Dose for Insomnia 7.5 to 30 mg orally once a day at bedtime. It may help you fall asleep faster during the night. Restoril works by slowing down the central nervous system (brain), causing drowsiness which helps patients fall asleep.