Our vertebral column has cartilages between the vertebras. Along the day these compress theirselves, like a spring because of the pressure made by the weight of our body. That's why at last hours of night we tend to measure between one and two centimeters less, according to the person's weight. But during the night, these cartilages expand theirselves because they don't have to support the weight of the body, so when we get up we have our real height again. This is why we go to the doctor at the first hours in the morning and not in afternoons or evenings.
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