To me, as a person struggeling with mental illness, this makes all the sence in the world. Simply because it absolutely doesn't.

There are hints, along the way you can guess what's going on but the way it plays out is just beautiful. You see the outside smiles when the inside is crying. You see doubts and moments of nothingness. You see coping meganisms and failures. And it's beautifully set up. It is slow, they give you time to take it all in, like the characters are doing. There are moments of great joy within the dark moments.

I haven't read the book. But to me, the way I could feel everything, it is a very special movie and indeed one of the best I've ever seen.