Mid Sleeper Beds A mid-sleeper's mattress is similar to a high sleeper, but it's a little lower and has a shorter ladder. They are ideal for small children or bedrooms with a limited space. Mid-sleepers come with a wide variety of versatile design features including shelves, desks or even tents. https://www.bunkbedsstore.uk/products/vonhaus-stylish-kids-bunk-bed-space-saving-solution