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