A never seen way to heat your bed

It's very common in the countryside of Northern China. The real type is that the underneath of the bed is connected to the oven so you only need to push the burning ashes towards the direction of the bed from the oven, when you are done cooking. That also means the oven is right behind the bed, being separated by a wall. And when it comes to chilly winter, the bed is the only place being heated so they even have their meals in the bed. This kind of bed, is called "?" in Chinese.

cook yourself up all night