A sleeper bus is a type of long-distance bus designed for overnight travel, featuring reclining seats or bunk beds for passengers to sleep comfortably. These buses often include amenities such as air conditioning, Wi-Fi, and sometimes even entertainment systems, making long journeys more pleasant. Sleeper buses are popular in regions where train travel is limited or expensive, such as in parts of Southeast Asia and South America. They provide an economical alternative to hotels, allowing travelers to save on accommodation costs while covering significant distances during the night.