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Doctor Thaddeus P. Westinghouse III, M.D., PhD
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Standing raises your blood pressure; your heart has to fight gravity to get blood to your brain and keep it there, so it pumps harder to increase the pressure in your arteries. Laying down has the opposite effect; your heart no longer has to work as hard and thus the pressure in your arteries decreases.
This is why you get dizzy when you stand up to fast, your blood pressure hasn't had time to adjust itself.
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