(2) We cannot stand at one place for a long time. How then can we sleep on a place for 8 and odd hours?
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because when we are on bed our body take rest and while we are standing our body is doing some work
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We cannot stand at one place for a long time but can sleep on a place for 8 or more hours because gravity is tough on us when we are vertical, first of all. Blood circulating all through the body has to get back to the heart continuously, and the feet are farthest away. Valves in the leg blood vessels open to help it pump upward and close to keep it from falling back down. That’s why our feet hurt so much when standing still for a long time.
Walkers/runners have an easier time because the motion helps keep blood circulating.
Lying down is easy. Gravity is exerting its force pretty equally along the body.
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