Got himself arrested and went to sleep!? WTF?
I assumed he was feeling sorry for that he accidentally killed a kid.
But it appeared it was just fear of `getting jailed`.
He got himself arrested and finally managed to sleep.
I think the ending did not match the plot.
Jailed or not, he is still the `killer`, so he's not supposed to find peace and `sleep` in jail.
IMHO, It would be better if the director did not show him fall asleep in that last scene.