A bed enclosure having a frame, four sidewalls, and a mattress support component suitable for supporting a bed mattress, wherein the bed enclosure is adapted to safely retain within its interior a person who may be prone to falling out of bed or who otherwise may need to be restrained therein, with the bed enclosure having component subframes that can be disassembled for ease of use and storage and sidewalls that can be removed for ease of cleaning, repair, or replacement.