The film’s title refers to a disturbing historical practice: indigenous women, often Iban or Dayak, who were taken as unofficial wives, servants, and translators by British colonial officers. The term “sleeping dictionary” itself is a violent metaphor—reducing a human being to a reference book, a tool for the colonizer to decode an alien world by night and navigate its language by day. The protagonist, John Truscott (Hugh Dancy), a young British administrator, arrives in Sarawak expecting to rule. Instead, he is given Selima (Jessica Alba), a literate and fierce native woman, to be his "sleeping dictionary." The film’s primary installation is this claustrophobic domestic space: the colonial bungalow. Within these walls, language is not shared; it is extracted. Selima teaches John Iban not out of mutual respect, but because his survival depends on her labor. The camera lingers on the physical proximity of the desk and the bed, showing how colonial epistemology (learning the land) is inseparable from colonial desire (possessing the body).