Hyun-su (Lee Sun-kyun), the male half of the married couple at the center of the devious horror comedy Sleep, suffers from a seriously disturbing case of somnambulism. But he otherwise enjoys the blissful slumber typically reserved for holy innocents. He drifts off easily and sleeps deeply, even when encased in the mummy bag and oven gloves meant to prevent him from unconsciously hurting himself. Sometimes, there’s even a hint of a smile on his dozing face, which starts to seem like more and more like an affront to his wife, Soo-jin (Jung Yu-mi), when she stays up watching him with a mixture of concern and fear. You can be in lockstep in every other area of your relationship, and still, sleep remains a kingdom that can only be entered alone. And when there, Hyun-su has a tendency to do upsetting things he has no memory of later, like stare into the darkness while muttering “Someone’s inside” or stand in front of the fridge eating raw meat. One night, he scratches his cheek until it’s gouged open, and that’s before the situation gets really dark — like, don’t get too attached to the pair’s little Pomeranian dark. Sleep is a film about parasomnia that’s really more about marriage — in particular, the idea that any relationship challenge can be overcome with enough dedication, even one that leaves you afraid that your partner is going to unwittingly do something terrible to your newborn daughter…