What happens when the person you share a bed with becomes a source of terror? Jason Yu’s debut feature film, Sleep, explores the answer to this unsettling question as it follows a married couple struggling with the husband’s sleep disorder. A contemporary portrait of marriage with a supernatural twist, Sleep is a collection of dichotomies: intimate yet claustrophobic, a tangle of traditional and modern ideals about marriage, and deafening in its quietness while stifling in its sound.
Labelled both a mystery and a horror film, Sleep is a simmering, slow-burn psychological exploration that has been done many times before. Yet what sets Sleep apart is its realistic nature, one that revolves entirely around the couple, breaking from horror’s more traditional external threats. With tight camera shots and a setting primarily within the couple’s small apartment, the film draws viewers into the intimate confines of their relationship, where trust, fear, and paranoia become inseparable.
None of this would be possible without the extraordinary performances of Sleep‘s lead actors. Soo-jin, played by Jung Yu-mi, and Hyun-su, portrayed by the late Lee Sun-kyun, have a natural chemistry that makes their relationship feel lived-in and authentic. Hyun-su is a struggling actor, and Soo-jin is his biggest supporter, adoring every scene he appears in and playfully commenting on his handsome appearance. This dynamic heightens the horror as Soo-jin goes on an emotional journey from supportive to fearful and, eventually, resentful as she crams fistfuls of sleeping pills into her husband’s mouth. Despite the growing terror surrounding her husband’s behaviour, there’s a palpable sense that Soo-jin is unwilling to let him go, trapped between love and fear.
Jung’s performance as Soo-jin captures the subtleties of her character’s descent into doubt and desperation. Her bursts of rage, though often sudden and jarring in contrast to the film’s slower pace, heighten the realism. The unpredictability of her reactions aligns with the chaotic emotional landscape that emerges when fear and love collide. While unconventional, this lack of refinement in pacing is precisely what grounds the film in a raw and unsettling realism. Soo-jin’s emotional outbursts, though unexpected, feel genuine and spontaneous, reflecting the mounting pressure she faces as the situation spirals out of control.
Lee, on the other hand, masterfully portrays Hyun-su, whose sleep disorder becomes a looming presence over the central relationship. He plays a man divided in two: one, a loving husband, and the other, an unpredictable force that jeopardizes his marriage. The horror of Hyun-su is that his performance lingers with a sense of vulnerability, but the unnerving part is entirely out of his control, despite his desperate attempts to manage it. This desperation, which offers no real solution, mirrors the experiences of real-life couples who suffer from sleep disorders—it’s not just the individual but the family that suffers. What can be done when the monster is a monster through no fault of his own? This unanswerable question underscores the tragedy of Hyun-su’s condition, amplifying the tension and sense of helplessness that runs through the film.
Where Sleep falters is in its shift from psychological horror to a supernatural explanation for Hyun-su’s condition. While this element drives the plot forward, it feels unnecessary in a film that excels at portraying a crumbling marriage and the complexities of female rage. Unlike other horror films depicting female rage as a one-sided breakdown, Sleep offers a more nuanced view of marriage—one where the husband always listens. Throughout the film, Hyun-su listens to Soo-jin, whether it’s when she convinces him to see a doctor or when she begs him not to sleep elsewhere, even when his leaving would be the safest choice for their family.
Yet, it is Soo-jin who doesn’t listen. She becomes increasingly wrapped in resentment, which festers as the story unfolds. This dynamic flips the conventional narrative of female rage on its head by focusing on how Hyun-su and Soo-jin view responsibility in marriage. While they each hold some level of individual responsibility, they don’t share each other’s perspectives on what it means to be responsible within the marriage. It becomes clear that Soo-jin doesn’t fully understand Hyun-su—her growing anger and frustration are partly rooted in this fundamental disconnect. Caught between her roles as a wife and a mother, Soo-jin is unwilling to move forward, but neither will she move backwards.
This emotional disintegration is where Sleep finds its true horror. While the film includes brief moments of graphic violence, the real terror lies in the crumbling connection between Soo-jin and Hyun-su. Once cosy and warm, their relationship becomes frantic and desperate, accentuated by a soundtrack that heightens the growing unease and discord. A commentary on marriage, mental health, and individual happiness, Sleep portrays the unravelling of a marriage haunted by something unseen and uncontrollable—and the inevitable heartbreak.
