Restoril (generic name temazepam) is a benzodiazepine medication primarily used to treat insomnia, particularly for people who have trouble falling asleep or staying asleep. It works by calming the brain and central nervous system, promoting relaxation and sleep. Restoril (temazepam) is highly effective for treating insomnia due to its sedative and calming effects on the brain and nervous system. It improves sleep quality, promotes fast sleep and reduces anxiety.