There’s an episode of Star Trek: Voyager (S5E1, “Night”) where they’re crossing a vast void with no stars visible because black clouds shroud starlight. The crew is going crazy. Then stuff happens, but it’s the set up that interests me: featureless darkness as a psychic stressor.
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I’m the dark days of stockholm. We have something like 5h of daylight. And I can definitely verify that it does cause depression quickly.
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That’s only one factor. Just light alone is a big deal. Serotonin production or something. Multiple things screw up without enough sunlight. Including the one I’m talking about which is the simple psychological effects.


