A bunk bed is a space-saving piece of furniture with two beds stacked one above the other. It is designed to sleep two people while using the floor space of one bed. Bunk beds are commonly made from wood or metal and include a sturdy ladder for safe access to the top bed. Guardrails on the upper bunk help prevent falls. Bunk beds are popular in children’s bedrooms, shared rooms, dormitories, and hostels because they are practical, comfortable, and efficient.