Chambers of Repose and Waking

The Room of Sleep was a room in Hollow Bastion built by the apprentices of Ansem the Wise. After the apprentices banished Ansem and became Nobodies, Xemnas would travel to the room. Inside was a single throne which Xemnas would sit on, as well as the armor of a Keyblade warrior named Aqua, including the Keyblade. Xemnas would speak to the armor, addressing it as a "friend".

Xigbar often eavesdropped on the conversations, and told Zexion that he heard another voice once. He also told Zexion he suspected that there was a link between the Room of Sleep and Castle Oblivion.