Horror would be very different without South Korea. The gloss of quality filmmaking that scary movies are now taking on is, among a thousand other parameters, down to the fact that the revered, ground-breaking Semaine de la Critique at Cannes is signing up plenty of works from our genre. The third film present at the 34th edition which was on display at the Espace Miramar, venue for the Semaine. It was also in the running for the Golden Camera, awarded to the best debut film. Sleep begins with a long, deep snore. Will we find ourselves nodding off as well? Not at all. How could you snore when the screen is filled by Lee Sun-kyun from Parasite (2019) and Jung Yu-mi from Train to Busan (2016)? How could you drop off when this mischievous, almost perfect film, goes beyond a case of sleepwalking?