Health, 19.06.2020 03:57 rayniqueamee2002

After sitting or sleeping, when I stand up I suddenly see everything black in front of me for only 3 to 4 seconds, then my sight returns normal, why that happens? if you know tell me especially if it's related to my health and thank you in advance.

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After sitting or sleeping, when I stand up I suddenly see everything black in front of me for only 3...