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Sleepwalker is a 1993 platform game developed by CTA Developments and published by Ocean Software Ltd. for the MS-DOS platform. The game is presented from a third-person perspective and follows the story of a cartoon dog named Ralph. His objective is to protect his sleepwalking owner, Lee, from harm as Lee unconsciously wanders through a variety of environments during the night.

Players control Ralph directly, guiding him through side-scrolling levels. The primary goal is to ensure Lee's safe passage by interacting with the environment ahead of him. This involves actions such as bridging gaps to prevent falls, defeating enemies that pose a threat, and using Ralph's ability to inflate his body to float over hazards. The gameplay is structured around six main levels featuring parallax scrolling, interspersed with five bonus stages. Between major levels, dream sequence segments allow Ralph to collect tokens, which influence the narrative outcomes.

Progression through the game is linear, with the player managing both platforming challenges and direct protection of the non-controllable character, Lee. The experience includes several full motion video sequences that advance the story. A separate version of the game was also released for the Amiga 1200 computer, which featured enhanced video sequences and improved in-game graphics compared to the original release.