I just saw it at the cinema and I really loved it. It's an amazingly beautiful horror film! Something type like "A Nightmare on Elm Street", "The Amityville Horror", "Mama" and "The Possession"..
The story was really interesting! The kid Cody (Jacob Tremblay) has unusual nightmares, but he can't live without nightmares until he finds one thing to realize something..
The acting were good, but Jacob Tremblay (the kid who played in "Room") was absolutely a fantastic and very cute kid in it.
Don't expect a scary movie that is actually scary, but it has some scary parts and good jump scares. The special makeup is amazing! The ending was beautiful and just sad, but also happy!
I gave "Before I Wake" a 9.5 out of 10. I recommend this movie if you want to watch it, it will give you an enjoyable time!