What Name, Usually Rendered In English As A Five-Letter Word, Is Given To A Foldable Mattress Which Is Traditionally Used In Japan As A Portable Bed, And Has Become Globally Popular In Recent Decades?

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1. What Name, Usually Rendered In English As A Five-Letter Word, Is Given To A Foldable Mattress Which Is Traditionally Used In Japan As A Portable Bed, And Has Become Globally Popular In Recent Decades?