Fever feels kinda nice
Idk, I just think lying in bed with fever is the coziest thing ever. Some of my best naps were fever naps. Fever causes your muscles to relax in a way they normally don't. It raises you body temperature making the environment feel cooler by comparison and that feels great under the blanket. I've also associated the feeling of fever with skipping school/work and eating comfort food which definitely enhances the feeling.
Also a second unpopular opinion: I like fever dreams. I like liminal spaces, horror and dream analysis, so they're right up my alley.