Here is a chart comparing Japanese and western bed sizes and some stores where you can get bedding to fit all your needs so you can sleep in your soft bed.
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The futon, Japanese traditional style bedding, is a type of Japanese mattress used on the floor at night for sleeping. This Japanese bed is
Foldable Futon Mattress, Queen King Single Size Japanese Futon Mattress Traditional Japanese Futon Floor Mattress Mattress Pad Sleeping Pad Guest Bed