Midi Bed With Storage These mid-sleepers that have storage are a great multifunctional piece for children's bedrooms. These low format beds are made from the standard UK single mattress and squeeze in plenty of storage elements beneath the bed. Many come with the pull-out trundle, which is great for sleepovers. https://www.bunkbedsstore.uk/products/panana-mid-sleeper-bunk-bed-in-white-wood