Andrew Huberman· PhD
The lightheadedness is actually because your vasculature, the capillaries and veins and, to some extent, even the arteries of your body and particularly in your brain, are actually starting to constrict.
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The lightheadedness is actually because your vasculature, the capillaries and veins and, to some extent, even the arteries of your body and particularly in your brain, are actually starting to constrict.
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Why? Well, because carbon dioxide actually is a vasodilator. Normally, it exists in your body to keep capillaries, veins, and arteries dilated to allow blood to pass through them.