hi hazar, I’m not sure that there’s any physiological reason but it may be that it helps us to concentrate so that the keep a steady hand and don’t get mascara all over our faces. A bit like how some people stick their tonuge out when they’re trying to concentrate.
Yes, i have also not heard of a physiological reason, but it is easier to raise your eyelids with your mouth open rather than closed and position the mascara where you want on the eyelashes.
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