* Sometimes the body needs a reset/check things are working. So it just sends a large impulse.
(that way you can also make sure blood but foremost *lymphatic* (fatty fluid between cells, not blood) gets circulation which is important for a number of reasons. (eg. the immune system between the cells))
* Sometimes when you relax, your old ape instinct kicks in and tells you not to fall off the tree. So you get a tiny panic, just so your very very old ancestors wouldn’t fall and the crushed by the ground.
(Not 100% relevant but, sometimes the body takes deep breaths/yawn to reset the respiratory system. You need to fill those lungs every once in a while)
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