The best bunk beds save a little bit of floorspace, they offer some variety (top bunk vs. bottom bunk), and there are a bunch of space-saving styles to choose from. From twin-over-twin designs ...

A bunk bed on top, trundle underneath. Stack 'em up and get ready for the ultimate sleepover showdown. Pop-up trundle: Want two twin beds that magically transform into a king? You've got it!