I've heard that is a really good movie, but the last time I tried to watch it, it had such a slow start that I got bored and turned it off. Not sure if I did actually fall asleep though.
On the other hand, I'm pretty sure I've fallen asleep to several superhero movies. Specifically the movie Man of Steel, as well as The Avengers. Can't really seem to get into the whole superhero thing for the most part. But I never have actually put any of them on to help me sleep better. I am more likely to use music for that.