Automatically adjustable bunk apparatus are described that can be used, for example, in applications in which space is limited, such as, for example, boats and recreational vehicles. The automatically adjustable bunk apparatus can be configured in an extended bunk configuration or a space saving retracted configuration. The automatically adjustable bunk apparatus have a substantially horizontal portion and an adjustable portion either of which can be configured to be movable between a retracted position and an extended position. When the automatically adjustable bunk apparatus is in its retracted configuration, the adjustable portion is positioned outside the plane of the horizontal portion, and when the automatically adjustable bunk apparatus is in its extended position, the horizontal portion and the adjustable portion form a substantially flat surface.