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[–] gl1tch 0 points 0 points (+0|-0) ago  (edited ago)

When we sleep our heart rate slows down. Blood does not flow freely to the muscles, which in turn leaves them oxygen deprived and with waste to be disposed of. Our muscles and joints might also be stiff from lack of activity.

Stretching - * elongating and contracting muscles all around your body* - makes the stiffness go away, the blood will flow quicker again, blood pressure to rise, which results in more fresh oxygenated to the brain. Sure feels good :)