the bunk-sofa

you would find the bunk-sofa on an internet platform like amazon or in any home shop like IKEA. 

The bunk-sofa is a sofa which transforms the sofa in to a bunk to sleep for two people or more, depending on how many floors you want to have.

You could put the bunk-sofa in the livingroom and when the person who visits you comes to your house you can offer him/her to sleep in the bunk-sofa.

At daylight it is a normal sofa but when you want to take a nap you press a button and take the pillows, the sofa will transform it self into a bunk with an stair.

It is more expensive than a sofa but cheaper than a bunk, this is for soung people and for someone who hasn't got space in his/her house.