Sleep Command is a feature found in various operating systems that allows users to put their computer or device into a low-power state. When activated, it saves the current session, including open applications and documents, while significantly reducing energy consumption. This is particularly useful for laptops, as it helps extend battery life. When a device is in Sleep Mode, it can quickly resume full functionality with just a press of a button or a key. This feature is designed to provide convenience, allowing users to take short breaks without losing their work or needing to shut down completely.