I think the concept was really cool, but the execution was sloppily done. They tried to cram as many weird/actiony things without any payoff which left me feeling like I missed some of the movie. Basically, it's a movie where it looks like a lot happens, but nothing actually really happens... All of the scenes are cliche or unnatural. And in a movie that relies on time (how long ppl can go without sleep) they really do a terrible job of letting the watcher know what time it is...like why would they be explaining to each other how long they all haven't slept?? You should probably skip it...