Happens. I did a couple tours up there in my younger years. I wouldn't recommend it to anyone though since you come close to either death or getting maimed about once a week up there. We had a name for the stare and lack of emotion one gets (Though anger always still remains) from lack of sleep - we called it the Aluetian stare, named after the survivors of the Aluetian Enterprise. They all had the same stare. These men also will have the same stare for many moons too. No fun.
-S
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