whats the difference between REM and REM atonia?
REM (rapid eye movement) is one of the phases of sleep where we experience the most vivid dreams. REM Atonia refers to the natural body paralysis which happens during the REM phase. Without REM atonia, we'd be acting out our dreams! People who have abnormalities with this are the ones who sleepwalk or sleeptalk, etc.

could reading that over before bed let my mind know whats significant to me at the moment
Sure, reading dreaming/lding books before bed really help put you in that proper mindset.

Have a nice day~