Mid Sleeper Beds A mid-sleeper's mattress is similar to the high sleeper, however it's lower and typically has a a shorter ladder. These beds are great for small children or bedrooms with limited space. Mid-sleepers come with a variety of design features, such as desks, shelves and even tents. Check https://www.bunkbedsstore.uk/products/white-cabin-bunk-bed-for-kids-solid-pine-wood