You lay something down; you lie down yourself
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"Lying down" is the act of reclining or resting in a horizontal position, whereas "laying down" refers to the action of placing something down. The correct term to use when referring to placing oneself horizontally is "lying down."
"Laying down" is used when you are placing something down, while "lying down" refers to the act of reclining or resting in a horizontal position yourself. So, you lay an object down, but you lie down yourself.
The force exerted by a person on the ground is the same whether they are standing up or laying down, as it is determined by their weight. The only difference is the distribution and contact area of the force between the feet when standing versus the whole body when laying down.
Yes, a person's height may appear slightly taller when they are laying down due to the spine's natural curvature being elongated in this position. However, this increase in height is temporary and does not change a person's actual height when they are standing up.
The height difference between night and day is mainly due to changes in posture and spinal fluid distribution. During the day, the spine is compressed due to the force of gravity, resulting in a decrease in height. At night, when lying down, the spine decompresses and some of the fluid between the discs is reabsorbed, leading to a slight increase in height. On average, this height difference can be up to 1-2 cm.
When lying down, gravity still affects your height, but the effects are minimal because gravity is acting evenly across the body. When standing, gravity compresses the spine slightly, causing a temporary decrease in height.