Restoril 15 mg is a medication that contains temazepam, a drug in the benzodiazepine class, primarily used to treat insomnia (difficulty sleeping). It helps individuals who have trouble falling asleep or staying asleep by acting as a sedative or tranquilizer. The 15 mg dose is typically used for people who need a lower amount of the medication, depending on the severity of their insomnia and their doctor's recommendation.