Midi Bed With Storage These mid sleepers with storage make a great multi-functional piece for children's bedrooms. These beds that are low in size are designed to accommodate a single UK mattress and come with plenty of storage space below the bed. Many have a pull-out trundle, perfect for sleepovers. https://www.bunkbedsstore.uk/products/children-s-pine-midi-sleeper-bunk-bed-heavy-duty