Evolution.
Lifeforms that turned off their senses to conserve energy were significantly less likely to survive to pass on their genes than lifeforms which always kept them active, which is why most lifeforms alive today can’t consciously turn off their senses for no reason.
Lifeforms that turned off their muscles to conserve energy were significantly more likely to pass on their genes. Also, it’s sort of required to control your body to turn off at least half your muscles at any given time.
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