Distrust

They were on a routine rescue mission when a helicopter crash left the two survivors stranded near an abandoned Arctic base. To find a way back, they must explore the base, moving from sector to sector, fighting the severe cold and searching for food and equipment.

There's something else, too. Something that should not exist but does.

The thing, that enters their sleep and suck the life out of their bodies...

Staying awake seems like a safe option, but the lack of sleep is exhausting and leads to hallucinations. Eventually, the survivors will close their eyes and fall prey to the unknown, terrifying force - unless you can somehow strike a balance between exhaustion and falling into a sleep from which one might never awake.