Mid Sleeper Beds A mid-sleeper's mattress is similar to a high sleeper, but it's lower and typically has a shorter ladders. They are ideal for smaller children or when your bedroom has limited space. Mid-sleepers are available with a variety of design features, such as desks, shelves and even tents. https://www.bunkbedsstore.uk/products/panana-bunk-bed-with-slide-and-ladder-grey