I was looking for bed frames, and when I saw this one, the first thing I thought was "Cool!! Built-in dog beds on a bedframe!! Best bed ever!!" Turns out, they're meant to be used as drawers.
http://www.ikea.com/ca/en/catalog/products/S29889578/#/S19889456
http://www.ikea.com/ca/en/catalog/products/S29889578/#/S19889456