In 1997 I helped save my sons life from Kawasaki’s Disease ( which at the time Miami Children's E.R. doctors were calling, "a liitle bug"),
 by regulating his 100+ fever the following way;
popsicles,
 thin sheets (not blankets),
leaving his feet exposed much of the time,
keeping a frozen bag of peas wrapped in a hand towel on the top of his head.
tepid baths,
cool room,
ice cream sandwiches,
 lots of water and gatorade,
cold fruit cups and cracker sandwiches.
I learned early on before I went to medical school that making a person “sweat out” a fever with blankets can KILL them.
I beg to differ with those who solemnly swear by dealing with fevers by throwing a blanket on it and hoping for the best!
A few degrees does matter! Very much so!

               I must add. When a feverish peron becomes uncomfortable to the point of      shivering, cover their torso and legs with a blanket,
when the shivering stops and the person recovers from it a little,
take the blanket off and leave only the sheet.
The purpose of shivering is to raise body temperature.
To successfully help regulate someone’s temeperature, keep close and constant watch over them until fever breaks, if possible.

p.s
Fevers are an important process of the body's defense system. Do not strive to get rid of it, just minimize it.