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this post was submitted on 11 Nov 2023
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No Stupid Questions
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I would say most things would not be much different, but circadian rhythm is probably the most relevant part. If your eyes cannot sense sunlight in the morning, ~~your sleep will no longer be affected by daytime hours~~. Edit: your skin can also sense changes in light, it could potentially also detect sunlight in the morning if exposure is strong enough. Thanks @Repelle for the insight! Article: https://www.sciencedirect.com/science/article/abs/pii/S1389556721000022
Our mind doesn’t really process the time we blink, whether light comes through or not. If we had it happen our entire life, I’m sure we’d probably adapt quickly to having a complete blackout when closing our eyes.
I vaguely recall a study from well over a decade ago where they used a light patch so that the only change in light for the sleeping participants would be on the skin and showed that circadian rhythm wasn’t dependent (solely, at least) on eyesight. Mind you this is a vague memory from a long time ago so take it with a grain of salt.
Not the article you were thinking of, but reinforces your point. https://www.sciencedirect.com/science/article/abs/pii/S1389556721000022
Tl;dr, there are light sensors, or at least light energy sensing mechanisms, in our skin.
There was a study of a guy who lived underground for months with no timekeeping devices. His only contact was with other researchers by telephone, and not often. His sleep schedule and length he’d stay awake got super wonky but he had no idea. So the complete lack of light certainly has an effect.