(ANSWERED)
I get its to prevent dust etc from getting in, but when sleeping your body is usually relaxed and not tense, but dead people aka people who can litteraly not be tense dont have their eyes closed but slightly open, why do we sleep with our eyelids closed if they stay open when theyre not moved by muscles, doesnt our body then have to like constantly put a bit of restraint on the eyelids to keep them closed? or has it just become so natural that it barely matters
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Eyelids are naturally almost closed, as you can see from your example. As for why they are closed, for the purposes of eye health that’s the easiest solution. During the day you need your eyes open but not does this only exposed to dust and such, but to drying, which is the sure fire way for the eye surface to get damaged in time. That’s why you blink frequently, to restore the tear film that protect the eye and finetunes optics.
Lids being closed circumvents that (Though it does cause the eyes to get oxygen a bit poorly which lead to a slight swelling of the surface. This is why you can often notice your vision can be a little off in the morning.)
Sleep also activates the parasympathetic (rest state) part of the autonymous nervous system, which among other effects lightly closed your lids.
With all this said some people do not sleep with their lids closed. Sometimes it may be a habit, and ever their blinking is poor and it can be resolved with some mindful blinking to “teach” The system to act properly. Sometimes it can be a hormonal issue. Yet occasionally there’s no clear cause and the person needs to have their lids taped or wear special blindfolds to prevent issues.
If you’re curious about if you should have such an issue it is usually in line with common dry eye symptoms. An eyecare professional can also diagnose it with ease, incomplete lid closure awake or sleeping leaves a very distinct mark in microscope examination.
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