I think you got some things confused. Your body temperature goes up and down a little normally and usually does not have an affect on your tiredness.
“Fever” happens when your immune system is geared up to fight of an infection (or other). You don’t feel tired because of temperature change or even the fever itself but due to the number of effects that take place as a result of whatever is causing the fever. Otherwise, an ice bath would immediately resolve all the feeling of fatigue. It doesn’t
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