Room in Room is a modern take on the four poster bed from tentmaker iKamper that aims to help reduce those heating bills. Based on popular South Korean indoor tents, it's designed to go over the bed and conserve a sleeper's heat, so the room temperature can be kept down. The design is the focus of a Kickstarter campaign running through December 26.

The box bed may seem like a historical curiosity to those who grew up with central heating, but for centuries it was the height of luxury. The box bed is a wooden cupboard used for sleeping that was developed during the Middle Ages and continued in use in some parts of Northern Europe until well into the 19th century. Like the later four poster bed with its canopy and heavy curtains, the idea was to create a small enclosed space around a sleeper whose body warmth would help to heat the trapped air.