What is a variation of a Japanese bed? That would be a futon. Western futons are normally sold with frames to make a futon couch. A futon couch is good for sitting, but when it is pulled flat it is also good for sleeping.

A futon couch normally comes in two sizes - full size and queen size, just like a full size mattress or a queen size mattress of a normal bed. The futon of a futon couch comes in different degrees of thickness.

Click Here for Futon Couch Article Part 2