What is the central idea of the second section:
what happens when we dream?

answer:

the whole brain is active during dreams, from the brain stem to the cortex. most dreams occur during rem (rapid eye movement) limbic system in the mid-brain deals with emotions in both waking and dreaming and includes the amygdala, which is mostly associated with fear and is especially active during dreams.

do you think i can get some details

walk away. if anything happens, call the police.