Mid Sleeper Beds A mid-sleeper's mattress is similar to the high sleeper, but it's a little lower and has an easier ladder. They are ideal for small children or bedrooms with a limited space. Mid-sleepers are equipped with a variety of versatile design features like desks, shelves, or even tents. https://www.bunkbedsstore.uk/products/maxmass-kids-single-loft-bunk-bed-with-slide