A Sleep Timer is a feature commonly found on electronic devices like smartphones, tablets, and smart TVs. It allows users to set a specific duration for the device to remain active before automatically turning off or entering sleep mode. This is particularly useful for those who like to listen to music or watch videos before falling asleep, as it helps conserve battery life and prevents the device from running all night. Using a sleep timer can enhance the user experience by providing a sense of control over device usage. Many applications, such as music players and streaming services, include this feature, making it easy for users to enjoy content without worrying about manually shutting off the device later.