The Caledonian Sleeper is a train service that operates overnight between London and various destinations in Scotland, including Edinburgh and Glasgow. It offers travelers a unique way to journey while sleeping on board, allowing them to wake up refreshed in a new city. The service features different accommodation options, including standard seats, private cabins, and en-suite rooms. Passengers can enjoy amenities such as bedding, meals, and showers, making it a comfortable travel experience. The Caledonian Sleeper is popular among tourists and locals alike, providing a scenic and relaxing alternative to flying.