Sleep

Sleep is a Korean horror thriller about a newly married couple expecting their first child. Their settled life is disturbed when the husband, Hyun-su, begins talking in his sleep, saying that someone is inside. What seems like a minor problem grows into something far more frightening: each night he undergoes a change, behaving in ways he cannot remember afterwards, and becoming a danger to himself and to those around him. His wife, Soo-jin, seeks medical help at a sleep clinic, but the treatment fails to stop the episodes, and she turns to a shaman in a last attempt to understand what is happening to her husband.

The film is the writing and directing debut of Jason Yu, previously known as an assistant to Bong Joon-ho. It was produced by Kim Hee-gyeong and stars Jung Yu-mi as Soo-jin and Lee Sun-kyun as Hyun-su, supported by Kim Kuk-hee, Lee Kyung-jin, Yoon Kyung-ho and Kim Keum-soon. It runs 94 minutes.

Released in September 2023, the film was made for about 4 million USD and earned roughly 11 million USD worldwide, a strong return on its budget. On IMDb it holds a rating of 6.6 from around 7,500 votes, while on TMDB its rating is 6.7 from some 262 votes. A critics' rating of 7.3 from 84 reviews places its reception among reviewers somewhat above its audience scores.