It is, perhaps, a bit too subtle. The cinematography has a washed-out, dreamy feel, and the nurse’s inner dialogue is delivered in a hushed monotone. There are some good ideas here, and some interesting ways of twisting time and memory, but it never really gives us characters we can like; rather, we get tropes who fit into a moody setting. It never feels like anything is at stake, since the story is a closed loop, and so it never succeeds in giving us a shudder.