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.
Maybe the dreams are true reality and what you perceive as being awake is simply a faded memory of what you believe happened. After all, your memories are mostly made up anyway.
i would believe this, if the physics in our dreams stays consistent, which it does not