Dreams are basically simulations of our lives that we run, sometimes with different physical constants, resulting in different worldly behaviours. Fever dreams (not necessarily during a fever) are when we are sweeping over a range of constants, so behaviour keeps on changing.
I dreamt last night that shortly after falling asleep, my dad woke me up because there was a shoot out across the street at the bank. In reality, earlier that night there was a car accident in the intersection, so there were cops and firetrucks all over the place, but it’s right in front of a bank so the first though I had seeing all the cops in front of the bank was that it was being robbed. My dream just simulated my earlier thoughts. lol