The Japanese use a style of bed called a futon, which is similar to the western style. The futon comes with a mattress and cover, the cover is called a kake-buton.
If you really want an unconventional look, then Japanese interior design will definitely give you what you want. Japanese interior design is not hard to create, there are simple designs that anyone can follow. You can use several sources for providing ideas for your Japanese theme. Interior design or interior decorating magazines would be a great place to start. As always, there is the internet to provide your inspiration.
When designing a room such as a bedroom based on Japanese interior design, it is important to visualize the function of each piece of furniture since Japanese interior design is based on the minimalist approach. Use Zen philosophy when furnishing your room as the Japanese use this approach when decorating.