Mid Sleeper Beds A mid-sleeper's mattress is similar to a high sleeper, however it's a little lower and has shorter ladders. They are ideal for smaller children or when your bedroom is small in space. Mid-sleepers are available with a variety of features, including shelves, desks and even tents. Review https://www.bunkbedsstore.uk/products/molly-midi-sleeper-cabin-bed-single-3ft