Sleeping Worlds

Sleeping Worlds
Japanese	夢見る世界
Romaji	Yumemiru sekai
Game	Kingdom Hearts 3D: Dream Drop Distance
Other worlds
Introduced in Kingdom Hearts
	Dive to the Heart \| Destiny Islands \| Disney Castle; Traverse Town \| Wonderland \| Olympus Coliseum; Deep Jungle \| Agrabah \| Monstro; Atlantica \| Halloween Town \| Neverland; 100 Acre Wood \| Hollow Bastion; End of the World \| Realm of Darkness
Introduced in Kingdom Hearts Chain of Memories
	Castle Oblivion \| Twilight Town
Introduced in Kingdom Hearts II
	Mysterious Tower \| Radiant Garden; The Land of Dragons \| Beast's Castle \| Timeless River; Port Royal \| Pride Lands \| Space Paranoids; The World That Never Was \| End of Sea \| Keyblade Graveyard
Introduced in Kingdom Hearts coded
	Datascape
Introduced in Kingdom Hearts Birth by Sleep
	Land of Departure \| Mirage Arena; Dwarf Woodlands \| Enchanted Dominion \| Castle of Dreams; Disney Town \| Deep Space
Introduced in Kingdom Hearts 3D: Dream Drop Distance
	La Cité des Cloches \| The Grid \| Symphony of Sorcery; Country of the Musketeers \| Prankster's Paradise
Introduced in Kingdom Hearts χ[chi]
	Daybreak Town
Introduced in Kingdom Hearts Union χ[Cross]
	Game Central Station \| Niceland \| Cy-Bug Sector \| Candy Kingdom
Introduced in Kingdom Hearts III
	The Final World \| Secret Forest \| Olympus; Toy Box \| Kingdom of Corona \| Monstropolis; Arendelle \| The Caribbean \| San Fransokyo; Scala ad Caelum \| Quadratum

Note: This information is based on an unofficial translation of Japanese material, and it may be changed by later publications.

The Sleeping Worlds are the main setting of Kingdom Hearts 3D: Dream Drop Distance. They were created following the defeat of Ansem, Seeker of Darkness, as a portion of the worlds attacked by the Heartless remained submerged in sleep. As this created barriers not even the Heartless could penetrate, a new form of enemy emerged in the Sleeping Worlds, known as the Dream Eaters.

Story

Kingdom Hearts 3D: Dream Drop Distance

As part of their Mark of Mastery exam, Yen Sid sends Sora and Riku to the Sleeping Worlds to unlock the seven Keyholes of Sleep, and return the worlds to the Realm of Light, but they come into conflict with the Dream Eaters and a mysterious young man with ties to Master Xehanort.

Eventually, Sora and Riku manage to seal the seven Keyholes in the Sleeping Worlds, but thanks to a set-up by Organization XIII, Sora ends up trapped in the World That Never Was and his heart is damaged during a fight with Xemnas. With help from Mickey, Donald, Goofy and Lea, Riku manages to save Sora from becoming a new vessel for a fragment of Master Xehanort's heart, and they return safely back to the Realm of Light.