It is also said that the origin of Takarabune was much simpler as a ship used for 'yumechigae' (putting a spell on bad dreams not to become true) or 'yumebarae (purifying bad dreams not to become true) on which bad dreams are floated down rivers to wash away bad luck (it is based on the idea of Oharae (the great purification) in which you let the water carry impurities away).
元はもっと素朴なもので悪夢を乗せて流すという「夢違え」または「夢祓え」の船が原形だという（穢れを水に流すという大祓の発想に基づく）。