The lack of a day-night cycle meant the contestants were sleeping in constant bright sunlight for months, if they even actually needed to sleep. They'd probably have insomnia/narcolepsy symptoms if suddenly brought back to a world where night actually exists.

They also haven't been eating food for months so they'd probably have screwy hunger recognition. Mainly meaning they all have a lack of appetite and can't tell when they need to eat.

They are the best of friends

also background:

i'm gonna continue tweaking about HFJONE being cannon to objectified wich means the plane and airy and Charlie and Charisse and Taylor and Liam and Bryce and Amelia an atom and the plane are all cannon and