Bunk beds are space-efficient furniture pieces that are two or more beds stacked vertically, typically found in homes, hostels, dormitories, and military environments. They are perfect for optimizing floor space, particularly in small rooms occupied by several people. Bunk beds are usually made of wood or metal and are available in different designs, such as twin-over-twin, twin-over-full, and even triple-bunk arrangements. Protective features like ladders and reinforced guardrails are crucial elements, especially for the top bunk. Contemporary bunk beds can also consist of storage units, desks, or convertible capabilities for extra function.