What is the name of an apocalyptic movie in which there are some survivors inside a building and everywhere outside there is a white light?

There is something else I remember, the main character always goes to another floor to speak with a young guy, that IMO might just be an alternate personality of his. All the survivors have to fight, not only the alleged creatures that attack them sometimes, but also their inner demos and they are all on the verge of maddness

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