Why put the head towards the north? Traditionally, in India, they tell you not to sleep with your head to the north. This is valid only when you are in the northern hemisphere. If you go to the southern hemisphere, say Australia, you should not put your head towards the south. Mostly, this body is designed in such a way that if you remain vertical, it is ideal. Now your heart is located three-fourths of the way up because pumping the blood up is difficult, pumping it down is easy, and all the arteries and veins that go above the heart are very thin. Blood vessels going down are much thicker.
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