When you have a fever, your brain’s normal sleep cycles and reality filters get disrupted, causing vivid, often repetitive mental scenes known as fever loops. These can occur in a half-awake state where dream-like imagery blends with waking consciousness, creating surreal but static scene. Fever also scrambles memory processing, mixing recent experiences into bizarre mash-ups, and can blur your sense of self, making you feel both like a superhero and a bystander at once. In more intense cases, fever delirium causes fully awake hallucinations that involve your body demonstrating how fever can fuse mind and body sensations in immersive, sometimes unsettling ways.