Here is an interesting piece by Esther Zuckerman in The Atlantic: Can We Talk About the End of 'Gravity'?

In the piece (this is your spoiler alert) Zuckerman speculates about several hallucinations, or possible hallucinations in the new blockbuster film Gravity. What is missing from the speculation is the obvious explanation: The Bullock character experiences the Angel Effect when she encounters George Clooney's resurrected character Matt Kowalski.

Some interpret the scene as simply the ebbing away of astronaut Stone's life, the lack of opxygen producing a brief dream-like interlude before total darkness. The film ends. Then lights up and make your way to the exit. In fact, Gravity is portraying something much more profound. NASA's Jerry Linenger had a real-life encounter with a sensed presence on the decaying Mir space station. That experience is described in detail in The Third Man Factor. 

What is more, The Angel Effect is filled with cases that illustrate that you don't need to be in space, or some other extreme environment, to have such an experience. It is something that can touch any one of us.