Why does your body/muscles feel a need to stretch when you wake up or feel drowsy?
by 
JoLDSgirl
ANSWERS: 2
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Stretching expands the chest cavity and lowers the diaphragm, resulting in increase in oxygen intake. More oxygen to the brain helps to wake a person up.
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That is true that the oxygen increases but it also is to get the blood fowing throw the veins and arteries to get parts of your body woke up. Ever sit for a while then when you get up you have to take it easy for a minute? that's getting the blood moving!
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