The Benefits of a Midi Bed A midi-bed is an ideal solution for bedrooms with children. These beds are lower in height than a high-sleeper, and feature a staircase or ladder to access the raised platform. Some beds come with an trundle, so you can add a mattress for sleepovers. https://www.bunkbedsstore.uk/products/panana-mid-sleeper-twin-loft-bed-with-slide