Sleep Tight (original title: Mientras duermes) is a 2011 Spanish psychological horror-thriller directed by Jaume Balagueró. The film centers around César, a sinister concierge working in an apartment building in Barcelona. While outwardly charming, César harbors a dark obsession with one of the residents, Clara, a cheerful young woman. As he secretly sabotages her happiness, he embarks on a disturbing journey to make her life a living nightmare. César’s manipulative actions slowly unravel, leading to a shocking and unsettling climax. The film explores themes of isolation, obsession, and the human capacity for evil.
