The authors/others interested in anxiety, may be interested in the paper: Dreaming Is the Inverse of Anxious Mind-Wandering:<p><a href="https://psyarxiv.com/k6trz" rel="nofollow noreferrer">https://psyarxiv.com/k6trz</a><p>Written by me and discussed on HN here:<p><a href="https://news.ycombinator.com/item?id=19143590">https://news.ycombinator.com/item?id=19143590</a><p>There is a coherent argument to be made that the problem of misplaced anxiety is so prevalent/fundamental to the species, that dreaming is a built in mechanism for diagnosing it.<p>A summary of the paper is:<p>Anxious states involve: The default mode ("imagination") network, high levels of the fight-or-flight neurotransmitter norepinephrine, and an active amygdala.<p>REM dreaming states involve: The default mode ("imagination") network, extremely low levels of the fight-or-flight neurotransmitter norepinephrine (80% below base levels), and (surprisingly) an inactive amygdala.<p>The content of dreams can be viewed as inverse anxious mind wandering, where situations we find ourselves in actually encourage confrontational behaviour, however we are able to observe our avoidant behaviour with clarity that is not so present in waking life. (This also indicates that anxious structures are not really associated to the neurological state, as in we still seem to follow our anxious patterns even when norepinephrine levels are low, implying that the structures that represent them in our brain are not affected by different levels of norepinephrine/must exist outside of something so variable.)