Restoril is a brand name for temazepam, a prescription medication that belongs to a class of drugs called benzodiazepines. It is primarily used to treat insomnia, particularly for people who have difficulty falling asleep or staying asleep. Restoril Capsule works by acting on the brain and central nervous system to produce a calming effect, which helps people fall asleep more easily and stay asleep longer. It is typically prescribed for short-term use, as it can be habit-forming and may lead to dependency if used for extended periods.