Nights into Dreams is a 1996 action game developed by Sonic Team and published by Sega for the Sega Saturn. The story follows the teenagers Elliot Edwards and Claris Sinclair, who enter Nightopia, a dream world where all dreams take place. With the help of Nights, an exiled "Nightmaren", they begin a journey to stop the evil ruler Wizeman from destroying Nightopia and consequently the real world. Players control Nights flying through Elliot and Claris's dreams to gather enough energy to defeat Wizeman and save Nightopia. The game is presented in 3D and imposes time limits on every level, in which the player must accumulate points to proceed. Development began after the release of Sonic & Knuckles in 1994, although the concept originated in 1992, during the development of Sonic the Hedgehog 2. Development was led by Sonic Team veterans Yuji Naka, Naoto Ohshima, and Takashi Iizuka. Naka began the project with the idea of flight, and Ohshima designed Nights as an androgynous character that resembles an angel that could fly like a bird. The team conducted research on dreaming and REM sleep, and was influenced by the works and theories of psychoanalysts Carl Jung and Sigmund Freud. An analogue controller, the Saturn 3D controller, was designed alongside the game and included with some retail copies. Nights into Dreams received acclaim for its graphics, gameplay, soundtrack, and atmosphere. It has appeared on several lists of the greatest games of all time. A shorter Christmas-themed version, Christmas Nights, was released in December 1996. Nights into Dreams was ported to the PlayStation 2 in 2008 in Japan and a high-definition version was released worldwide for Windows, PlayStation 3, and Xbox 360 in 2012. A sequel, Nights: Journey of Dreams, was released for the Wii in 2007.