Sleep has probably one of the best premises for a horror film that I’ve ever seen. The idea of the person sharing your bed doing strange and sometimes terrifying things in their sleep is almost a *primal* fear, something inherent to every and anyone who shares a bed with their partner: “What are they doing in their sleep? Am I safe with this person next to me?”

It’s such a brilliant concept, that the movie almost writes itself. And that’s the thing…this movie needs better writing. There’s something missing from the narrative, undoubtedly there to keep the mystery and ambiguity the entire way through, but it feels like the script needed a bit more complexity. I wished the characters and their relationship was fleshed out, that we learned more about them and their dynamics, to help really generate discussion as to what’s going on. I wish an unseen and unheard character didn’t have such an impact on the narrative; someone who is only mentioned a couple of times and very briefly. The film also jumps forward in time at several points for no apparent reason…it raises more questions than answers and I get the sense that no one knew how to address some of these plot holes.

It’s a shame, because there’s so much about this movie that works. It’s very scary at times, generating enormous tension that you can cut through with a knife. And there’s a wonderful bait-n-switch where your perspective on what’s going on is tested and it’s a juicy prospect. The film also has a wicked sense of humour and that always helps with otherwise very dark subject matter.

The performances are also quite excellent; Jung Yu Min in particular carries a lot of this movie on her shoulders and she’s absolutely EXCELLENT. I just felt like all the other characters weren’t fleshed out enough for me to really connect with them. Korean horror is renowned for its character work, slow pace, and shocking twists. I wish this movie took its time more and did a bit more world building. At a scant 95 minutes, it certainly could’ve used another 15-20 minutes to do that, and it wouldn’t have made the movie worse.

However, I can’t pretend like this isn’t a good time. The film is creepy, effective, and again, just has that killer premise that’s inherently good. Is it perfect? No. Could it have been even better? I suspect so. But given this is Jason Yu’s first film, it’s not a bad debut at all.