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Given the current state of affairs, I’d argue that brain damage hasn’t seemed to inhibit that much reproduction.

Is this the thing where the immune system evolved to become more active at night because then we rest anyway - no resources needed for walking around and hunting etc.? (which would then be achieved through cortisol levels)

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Specifically in the case of Malaria, the fever bouts come and go because the parasite migrates between the centre of your body and the periphery, depending on whether it wants to be picked up by mosquitos. Besides this, it changes its immune epitopes on the reg, trying to fool your immune system which attempts to learn but gets confused by the constant changes on the surface of the parasite individuals.

Since flu season corresponds to actual seasons the northern and southern hemisphere alternate flu seasons. The flu stains circulating are monitored in the opposite hemisphere and used to predict which vaccine to give in the upcoming season.

Is there a way to increase cortisol levels naturally without having to take prednisone, for example?

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Also, I always assumed the vampire teeth sucked the blood either directly into the bloodstream of the vampire, or into some special processing organ

Adding to what already has been said, Cortisol levels fluctuating thanks to the cyrcadian cycle also have a saying in this. It acts as antinflamatory during the day, leaving you rekd at night to cope with the matter.

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To a certain extent, yes. You should take an antipyretic if your fever is high (above 39.8°C) and doesn't break. At least these are the recommendations I've always gone by myself. It just prolongs how long the body will fight off the virus. This is the same for cold and flu medicines.

Medical knowledge here: to add on to what others have said, if your body stays at a high enough temperature for a prolonged period of time, there begins to be damage from it. Hearing loss, brain damage, seizures, vision loss, etc.... It has to fluctuate to keep the body alive aka homeostasis.

Also important to point out, that one of the common reasons people find out about gastric or bowel cancers is that they are anaemic. Iron deficiency anaemia is an urgent referral for endoscopy in the over 60s here in the UK, under the '2 week wait' cancer pathway.

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Many restaurants put rice in the shaker to help break up clumps that form when it a absorbs moisture.

So, based on this, does taking a fever reducer (e.g. acetaminophen or ibuprofen) also reduce the fever, and/or the body’s ability to fight the virus?

Depending on the cause, chronic anemia can be normocytic or even macrocytic, it’s not always microcytic

That's why chronic disease is normocytic while with blood loss is microcytic. Unless with long term small bleeds the body adapts to eventually make them normal size too.

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And that is why we can't differenciate between taking Tardyferon and a GI bleed - the stool is black in euther case, and the tests for blood in stoll post a positive.