Mid Sleeper Beds A mid-sleeper's mattress is similar to a high sleeper, however it's lower and typically has a a shorter ladder. These are great for younger children or when your bedroom is confined in space. Mid-sleepers come with a range of design features, including desks, shelves and even tents. https://www.bunkbedsstore.uk/products/mid-sleeper-kids-bunk-bed-frame-in-grey-white