After leaving the dead forest the two had “died” in, they eventually had made their way to New York City in search of Allies quest to go home, despite being dead. They were still on the outskirts of the city, when Allie spoke up

Allie: she turned to Nick after watching the sun set on the horizon “We should stop here at this dead spot and sleep”

Nick: he turned to look at her after she spoke and out an audible sigh “Allie, we don’t Need sleep anymore, hell we don’t even need to breathe anymore”