The answer to the continuation of the post and it will surprise you for sure;)
In Soviet times, one almost the most important subject in each house was the so-called "clamshell". After all, where to put to sleep, for example, your mother, who came to stay for a couple of days, or your friend who stayed with you for the night. But as a rule, to sleep on a cot - it's a living hell. See more on the creative box on this photo, which will change your understanding of the fold-out beds.