It&#x27;s common in a lot of countries. I took one in Vietnam and it looks like this (a bit denser than these buses, I believe)<p><a href="http:&#x2F;&#x2F;www.sapavietnam-tours.com&#x2F;image&#x2F;sleeper-bus-sapa-vietnam8.JPG" rel="nofollow">http:&#x2F;&#x2F;www.sapavietnam-tours.com&#x2F;image&#x2F;sleeper-bus-sapa-viet...</a>