I really enjoyed this film. If you are a fan of slow burn, psychological horror films and you're happy to watch indie films and not just high budget Hollywood ones, then this is for you.
I'd read a few reviews which stated that the plot is confusing (particularly at the end). I really don't think that's the case, the plot development is perfectly clear and most people shouldn't have any trouble following it.
For me, It Never Sleeps made good Saturday night viewing and I will be recommending it to friends with a similar taste in horror films to me!